you dont strictly need to de-solder thm, they're glued on, and if you just cut away at the motherboard, you'd be able to get the away easily
also if you use sockets on this new mobo, you'd just be able to slot them in, as all the other stuff sould already be built in......pci slots / power flier, scan doubler etc
i mean you have the mobo design, and all the hacks already available, its not like you're really designing sometihng new, just putting the, all together, and spacing out the board a little, the curcuit diagram sint really going to change much