I'm sure if I knew how to use C++, I could do a better job, but it seems to be working. I guess Skid would say that calling directly back into the Max module from my glue code isn't a good idea, but it works.
I doubt it would be possble to interface directly with blitzmax, so yes c++ glue all the way! I got a bit lost in the C++ wizardy required to manage their message map thingys but that was quite some time ago and they may have a more runtime oriented approach to hooking everything up these days.
I remember thinking running a qt gui engine on a different thread might also make things easier to build.
Anyway, even if you don't get the implementation that far along, I'm sure there would be some of us interested in contributing to it's progress, so if you could release source as soon as is convenient I think it would be a really good thing!