Thanks guys. With the over-kill, external heat-sinks amp gets only to "warm" at 140ma bias with most heat outside of case. The availability/price/quality/size of those off-the-shelf cases is what tempted me to go ahead w/CNC & building at least two of them.
WRT front panel/ε12 board - Thanks, yeah like the least # of wires & within-case wiring and don't care for Molex KKs (haven't the proper tool) hence the screw terms.
A small CNC setup is something that's always tempted me & once one's in the house & you're somewhat proficient you're on the prowl for projects for it. So far about 1/2 its projects were related to this (front/back panels, heat-sink mounts, front panel/ε12 board), the other 1/2 things around the house - perfectly round holes are no problem as long as within its work envelope. Still new & learning but its great fun. Posted some of my experiences under same user ID here: http://www.microcarve.com/forum/showthread.php?tid=224