Housing Sub Plate Amp...

I've built a sub; however, because of how the sub is constructed, there is not room to physically fit the plate amp I have selected on the actually body of the subwoofer. Because of that, I need to build separate housing for the sub plate amp.

Any ideas about this before I build somethig cheap and amateur.

The sub amp will probably get placed on the rack below the amplifier and preamp, hopefully.