my calculations appear to be good. it looks like the shop walls will be 12ft and with the scissor-style roof trusses gives me an inside ceiling ridge height of almost 15ft. that puts the roof line of the whole building at the same level without having to step it. the guy that is supplying and installing the roll-up doors is another fella i have known many years. he will be installing tracks that follow the the angle of the trusses so the doors roll up out of the way and provide plenty of clearance when there is a car on the lift. ![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)