Les,
I made a trial one which was too heavy (over engineered) but the principle I'm aiming for is a fixed lower bracket with legs in order to bond to a roof then a second bracket which holds the solar panel, both pivoting around a central bolt - I'm trying to work out a clock face type way to allow rotation, or 45degree steps as a minimum. Then the panel would pivot up with 3 different positions in order to gain the maximum from the late year (fantastically bright) days. Then when in the lowered position, it could be bolted as one unit to stop peeps playing with it when you're not on your boat....
I've been talking to a few boaters regarding what I've been doing I've enquired about a stand at Crick to show what I'm doing....
Basically, the price woudl be right as my unit has very low overheads which aren't passed on...
I will post pics when I have something but any suggestions would be welcomed.