The Thermaltake Core X71 is a big case designed for custom-loop watercooling systems. Though the case has a lot of radiator mounting locations - but far away from each other and from the CPU block (as the huge case is intended for longer custom tubings).
Since you will be getting an AIO liquid cooler (such as the 280mm-sized Kraken X62) the pump block is already pre-attached on the radiator via flexible tubings (closed-looped). Such tubings are short and the only logical position in the Core X71 case is on the top -- the one closest to the CPU.
The case can support 280mm radiator on the top, on the front (but the AIO's tubing might interfere with mobo components and stretch out), and on the bottom-left/right sides (this is far away from the CPU and won't reach the mounting location for AIOs).
In short, install the X62 on top of the the X71 case.