make your own cover with epoxy putty (bondo or pro-poxy).
cover the components on the bottom with clingwrap add some cardboard or other filler to get some offset for air circulation, cover that with with a sheet of wrap and conform to screw hole areas. spray on some mold release and then apply putty. you can sculpt it like clay a bit when it has started to set. after it has set you can drill, saw, file, sand as needed.