I don't even have my Quark yet, and I've been contemplating this. Perhaps a case that will accommodate the addition of four caps as well. I don't think it will be hard, but I would prefer to use anodized pieces of aluminum.

Once I get my Quark, I'll take it apart. Maybe the easiest way to do it would be to sandwich the controller between two pieces of aluminum with all of the surfaces of the fets making contact with the aluminum to draw the heat away. I'd just use some thermal compound between the fets and aluminum plates and then make some standoffs to screw into, effectively clamping the esc between the plates. This way, if you ever did blow up the esc, all you'd have to do is put it back into its stock case and ship it off to S&T.

I'll have a better idea when I get mine in tomorrow. Then again, I just may be too excited to mess with it. I might just want to throw it in to see what it will do. I hope the caps get here soon.