You are not using freon, sorry dude.
If you havent made a waterblock before, I suggest keeping the project simple.
If it were me doing a school project, I would have data showing the temps of stock cooling vs watercooling, or waterccoling noise temps vs watercooling noise temps. Something that has purpose, things that can be useful if posted on this forum.
I have made a few waterblocks for the AMD platform, but I havent yet been comfortable enough to peal off the radeon heatsink and replace it with a DIY.
If I were you, I would focus on just one waterblock.
Seriously, thinking about doing all this stuff is great, but actually doing it is a pain in the butt.
Here is where you can find some mounting hole dimensions.
If you are making a rotor or WW style block, 7.5cm x 5cm is roughly what u want in regards to the dimensions.