Oh, and I meant to mention - I spoke to the nanotuners.com folks and was told that the HQI subassembly for the BC29 - which includes the heat-shield, bulb sockets, reflector, UV Glass, and mounting hardware can be purchased separately, but you have to phone the order in.
i'm just thinking that since the hood already has the PC's and moon lights, as well as a 2x36W PC ballast.. and I have the pendant with the 150W ballast, it ought to be possible to just get the reflector, slap it in and away we go..
There's a post over on n-r that deals with this subject in the DIY section.. I don't know what the rules are for posting links to other forum sites here, so i'll leave the exact location as an exercise to the reader to locate.
Another post over in RC's DIY forum has links to a n-r post as well where someone modded a BC29 with a 150W MH as well.