Thanx for the comments guys here are some more pics and details. Walls are insulated with insulation foil and of course the lining boards, roof is insulated with foil and insulation batts.
Vertical load bearing is heaps better than the average garden shed--espescially once youve removed the roof. Pre painted --your choice of color I have rivetted the sheets to the upper and lower rails in strategic positions to improve intrusion integrity.
The roof rolls on 6 wheels in 6" purlins.
Only part of the roof slides open--due to the odd shape of the observatory and after much design consideration came up with a design of sealing a sliding roof to a stationary roof as it closes, works brilliantly and is as tight as a fishes a***e.
