Agreed , it all comes down to who's sand box you are playing in as to how well your solution needs to perform. I started out being happy running a pair of DBC equipped tanks around my living room, and somehow ended up having to make tanks to Danville standards! [X(]

I'd be interested in testing one of your HBU design's this winter, if you could mount it on a DB9 plug with Phil's pin out - if nothing else than to satisfy myself that my attempt to meet club specs failed due to my ham-fisted efforts, and not because of the HBU being a bad start point?
PM me if interested.

Ta,
Mart