I gather, then, that you want those RGB lights to be highly visible from the OUTside of the case. You are not trying to make them show clearly on the INside. So first, my suggestion about how to achieve that for the FRONT panel still holds if your location is on the side. That involved two deviations from original design. You'd have to be able to mount the fans on the side of the rad OPPOSITE from the hose connections, and with the RGB lights facing out so the fan still pushes air through the rad. THEN you'd have to find a way to mount that assembly to the inside of the case on the right side. Could those be done? Of course, this would convert those rad fans into INTAKE fans, but some people prefer that because the air flowing through them to cool the CPU is outside cooler air. Then the top Noctuas would be exhaust fans, and overall that is a good arrangement.
Even if you were to change the fans, you'd have exactly the same problems to solve. However, MAYBE other fans' frames are built differently so that the whole task is easier.
This would not leave very much light inside the case. If you want lights on the inside, I can make two suggestions. One is, IF you replace the rad fans, then re-use those Enermax rad fans as the top exhaust fans (instead of the Noctuas). OR, add a few ARGB light strips mounted inside the case around the edges. In either of these situations, you would be adding ARGB lights to what you have already in those fans. This creates another factor to figure out. You have not told us what mobo you have , so the potential answer varies. Start with: most mobo ARGB headers can power and control a limited number of lighting devices. With the Enermax system you have three fans plus the pump lights, so that's four ARGB lighting devices. IF you are using the control box supplied with that system, it certainly can power all that, but I would not expect it to handle more lights. So any you add would need their own control box, and the two displays could NOT be synced. On the other hand, IF you plan to power and control all the lights from mobo ARGB headers, first you need those headers on the mobo. And again, I expect that no single mobo ARGB header could handle the four Enermax units PLUS several others. Thus, you would need a mobo with TWO ARGB headers. IF you have that, then the mobo ARGB lighting utility probably CAN sync all the lights on its two header ports.
As you say, the case does not have an obvious place on the rear panel to mount an exhaust fan. You probably do not need one there. Three top exhaust fans likely have more air flow capacity than the three rad fans mounted as intakes, because the rad itself reduces air flow from those fans. But IF you actually want a rear fan, there is an open grille in the back of the case apparently intended just for passive air flow. Depending on its dimensions, you probably could drill a few holes there and mount a fan, even if it's too small for a 120mm size. You can get 90mm or 80mm fans, too.
IF you choose to replace the Enermax fans with others on your rad, take into consideration these two points. Look for fans designed for use in high backpressure situations like a rad fan. They often are termed "pressure" fans, as opposed to "air flow" fans. Look closely at the specs for the fans. Most fans include specs for max air flow, and max pressure. The actual air flow delivered by any fan is reduced as the resistance to air flow (backpressure) is increased by items in the flow path. Those two specs can be viewed as two limiting points on a fan performance curve plotted as actual air flow versus backpressure. At zero backpressure (free air flow) you can get the max flow spec. At some higher backpressure (the max pressure spec) you get effectively zero air flow. Between those two points the "curve" is very roughly a straight line, so you can sketch your own graph for any fan from its specs. For an example, look at specs for the many models of Noctua fans. Now, Noctua does NOT sell any RGB lighted fans, so you won't be buying theirs for this, but the numbers are useful examples. Some of their fans are optimized for good air flow against minimal backpressure, and have pressure ratings of about 1.0 to 1.5 mm water. Others are designed for use on rads and CPU heatsinks, and have pressure ratings over 3.0 mm water. You need to find rad fans with those higher pressure ratings, plus good max airflow ratings. In fact, as you consider several fans models, you can sketch the "curves" for each on the same graph and compare at higher backpressures (to the right on the pressure axis).
The second point is to check the connectors for the ARGB lights on the fans. Some popular makers were early into this field and have used connectors that do not match what has become common among others, and on mobos. If you will be buying fans PLUS a matching ARGB control box and NOT trying to connect to a mobo header, that can be no issue. But if you do plan to use a second mobo ARGB header, ensure the fans' ARGB connector matches what the mobo header has.
Of course, you also need to keep in mind that there are two incompatible RGB lighting systems dominating now. The plain RGB system uses a 4-pin connection that includes a 12 VDC power source and three switched Ground lines for the three basic LED colours. The more advanced system (which is what your Enermax items use) is called Addressable RGB or ADDR RGB or ARGB and uses a three-pin connector (VERY like the 3-pin one but with one pin missing) that supplies +5 VDC and Ground lines plus a digital Control Line. Because both the power supply and the method of control of displays are very different, you can NOT mix these two systems on a single circuit. So you need to match the RGB lighting device type you have with the header type on your mobo IF you plan to power and control lights from such a header. The NAME of the RGB control software (ASUS Aura Sync, Gigabyte RGB Fusion, MSI Mystic Light, etc.) does NOT tell you this. You must examine the specs of the hardware header on the mobo to determine what type of system it uses. Sometimes you find both header types on a mobo, sometime not.
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