2 mm thick, 100x100. Mounting holes 90x90 , heat sink holes 62x55 all 4 mm DIA
That's all.
If you want to make rendered image this is different story
also, from main thread, keep in mind pcb is designed to be mounted on heatsink, and not the other way round. i.e. pcb cannot take the weight of the heatsink.
Also use M3 screws and not M4 for mounting to account for expansion under heat, etc.
So what's the purpose of the mounting holes, then?
maybe if u use a light heatsink... 32W of heat does not need very thick heatsinks as most people are planing...