After some discussion with the architect and starting the initial planning, we think we are going to settle in on something around 30' deep and 35' wide. We'll probably do 10-11' ceilings and 8-9' doors.

Some other thoughts that are floating around...

cedar siding (natural look) with brick or rock on bottom third.

actual reclaimed barn wood for baseboard and trim

8' tall solid wood (knotty alder, pine or similar) interior doors

walk in shower design with no door