I am using Ultra cote which seems to be working great.  Im sure you could get a better scale appearance with other coverings, but I just wanted to get it done.

I have a couple tips for you. -

1) use the dremel sanding drum and the milling bit to cut out the plastic parts
2) Be very careful when mounting your engine mount to make sure it is centered.  Last night I realized that mine was off center and now I have to make a whole new one from scratch!!! ARGHH!