Upgrading the Logic Board in MacBook Pro

I have a model A1150 MBP that still runs great, however, I'd like to upgrade the logic board by replacing it with one from model A1260 so that I can increase the maximum RAM to something greater than 2 Gb and increase the processing power. First of all, is this possible? Secondly, I am already aware that I will need to replace the lower case to accommodate the new board, will the top case also need replacement? Also, will the OS need to be reinstalled?

Thanks.

(PS: I am running dual boot with XP Professional, and these modifications are to make the Windows side run better)