I have done this mod and you will need to slightly mod the 1.0 case or you will blow you're box!
You most remove the two screw pillars that don't corrispond to the new motherboard, they will be on the left if looking from front to back!
I used a stanley knife to cut out the pillars, then you will need to push the metal case wings down and cover with electrical tape to avoid contact/short to the motherboard( these come up over the pilars to provide an earth for the old 1.0 MB ).
Then you can safely affix thew new motherboard in place, the psu will fit perfectly as the only difference is the molex power connector!
I had to fiddle a bit to get the controller ports to fit the new motherboard sockets as they are set out differently, i think i swapped the ports over!
Hope this helps you!