im guessing ur screwing ur motherboard down to that? if u can get a case and cut it down so u have the motherboard held and the u got the slots for the cards to screw to.. its what i did.
once ur screwed down (motherboard to case and case to mdf. earth the case and the mother board again. (infact EARTH everthting cos u will get alternator whine if u dont)
u need to find a way to get the graphics card or any other cards u put in to stay still.. i left mine held in by the screw and it was a nightmare go over a bump and the graphics card would move a fraction and crash the pc. u need to get some cable ties round it and tie the sucka down tight.
other than that u need a another fan other than the cpu one if ur gonna cover that up and a ventalation bit cos it will get hot in that little area mdf isnt the best for dipersing heat
Well over the top of it all will be a sheet of perspex, i'll drill some holes in that mount a fan to the underside. I might cut a circle out the carpet to show it off or again I may just put holes through the carpet where the fan is.