I HAVE NOT YET BEEN ABLE TO PRINT AND TEST THIS THING. FITMENT IS NOT GUARANTEED.
That said, the design and dimensions are based on a similar set of custom
...Plus brackets that I -have- printed, and that do fit, so I'm reasonably sure these should work as intended.
Okay, with that out of the way...
This pair of brackets will allow you to suspend a U-flow 480mm radiator between two of the window-mounting corner posts on your Thermaltake Core P5 chassis. I have tested the dimensions I used on these and determined that they will work for a TOP MOUNT, but If I'm correct in assuming the case to be a square layout, they should also allow you to mount a rad on the FRONT, BACK, or BOTTOM - assuming, of course, that doesn't impede any already-mounted equipment.
You will need to print BOTH of these files to mount a rad. One side is meant for the endtank end, and the other side is meant for the terminal end. The rad is offset by 10mm from the centerline of the case so that the fittings and tubing on the terminal end do not impinge on your mounting post.
These brackets sleeve over the stock posts and will still allow you to use the window once installed. They slide on the posts, which means you'll be able to tuck your rad up tight to your case, or have it out closer to the window if you like.
These can mount to the fan side or the radiator side of your "sandwich," but as they are 5mm thick you may need to custom cut some screws for the correct length if you bolt them to the rad.
If you do download and print these, PLEASE leave feedback! I have already had my own custom pair done and so don't plan to print a pair of these for myself. I'd like to know if they work, and hear any suggestions on them!