It's parked until after the holidays, too many things piled up at the moment, not to worry it is definately happening. I did get a preliminary mechanical layout figured out, looks like the transformers, 4 tubes and standard 2.5" tall T4B will all fit in a 2 bay module. I'm waiting on some flyback xfmr samples from coilcraft. The design for my flyback booster circuit is completed but of course is all theory right now, but based on conversations I've had with them and LT it looks like it's got a very good shot of working as intended, and being in the realm of 10% more efficient then the current (DC-DC converter followed by booster) circuit that everyone seems to be using. Looks like the flyback version will be fairly cheap, hopefully no more expensive then the current solutions as if it works out it'll utilize an off the shelf $10 transformer. It will likely be surface mount though, in that case I might just have them built up and provide them completed. Heaters will be addressed via a buck converter circuit, also probably surface mount (perhaps I'll just roll it all into one board) These are minor concerns though, will worry about the details later (ignore my ramblings).