Very Very Nice Jeff... mine is about the same size as yours but I went for the high ceilings.  I've got an office and bathroom on the left side and a 300+ sq/ft loft upstairs for parts.  If I did it again I would probably just raise the eaves and do a complete second floor.  What are your shop walls covered with?  It does look very classy... I like it!
My version of the poster!!