Recently upgraded Bro Drapers HP Pavilion desktop,well replaced everything within,mobo fitted existing case screw hole no prob,had to change the PSU though.
Been bulding me own machines since the days of the 33 mhz 486,before that I had been paying people to upgrade memory install HDs ect,bought a doubler chip to take it up to 66 mhz and had a look inside the case for the first time took out two minutes to figure out a monkey could build one of these things.