Thanks Guys lots of good info here, never thought about office chairs but I will go with that for sure you can pick up one for free just by driving through a office park, the doors won't be a problem due to the shape of the shop but good to get out there to prevent someone from having a DOH moment after a lot of work. The designer thinks we can go with 10' walls with out dwarfing the house and get another 18" in the middle with the rafter shape. the lights are going to be recessed between the rafters so they will be flush with the ceiling. Anyway it's taken me 40 years to get to the point of having a real shop so I'm getting pretty worked up about it.
Thanks all, Marty