Thanks for all the well wishes and input, it's appreciated.
I have an existing propane heating solution that I will be using in addition to the wood heater, and, sorry, I won't be talked out of a wood heater.
I think the contractor has a solution for the flue, that he has used before.
As I said, the shop will be 24 by 36, with a 12 foot wide lean-to down one 36 foot side. The lean-to will have a concrete pad also, but lower than the shop floor. Seven windows at least (still deciding), 16 foot garage door and 2 steel entry doors.
Studs on 16" centers, trusses on 19" centers. The lower 4' of the walls will be pressure treated ply with OSB above that, on PT plate.
Vinyl siding to match the house. I'll be doing the wiring, insulation and sheetrock.
Like I said, I'm as anxious as a young-un waiting for Christmas.
ken