Hopefully your case has more room than pictured because power supply is not shown.
Also, you will need to account for fitting offsets, radiator thickness and fans in terms of how much room you will have when it comes time to incorporate tubing bends as this can easily take more space than you might think.
Having all the radiators as exhaust means you are pulling air in from every crevice and gap, dust will build up in strange places.
You want to have an intake somewhere, and they should be filtered..
In this arrangement I would switch the typical rear exhaust to an intake after adding a dust filter. That way both radiators are being cooled with ambient air. One radiator will be getting completely outside air, the other will be heated slightly by the GPU and motherboard, but not that much since most heat will be leaving via the water.