Thanks!
I do have the heatsink on the bottom. The heatsink is a 1/8" thick piece of angle aluminum with extra heatsinks epoxied on top. This allowed me to mount it the ESC on its side to save some room. The pic below is a little different than it is now (the top HS are different and larger), but you get the idea...
Smertzhog (I hope I spelled that right) did a mod where he attached super large heatsinks all over it. Jhautz machined the heatsink found here in the store. Maybe one or two others have done some type of mod, but I can't remember off hand.