Thank you all, the general consensus seems that garage storage is OK, I will cherry pick ideas, definitely Silica Gel, (where do you get it from?) and the storage box seem to suit my needs, I have a Bismarck hull waiting in the wings, so I am thinking of maybe a double width box, perhaps an 8x4 ply sheet cut at (2) x 2ft x 8ft top & bottom, and another (3) x 1ft x 8ft, sides and ends, and that gives me a bit of spare to play with.
Piano hinge at the far end would enable me to lower the box for easy access, possibly some 1'' dia dowel rollers to keep it smooth, and restraining cords on the box, so that it doesn't end up vertical.
Already I see a whole new garage enterprise taking shape. I love designing things, as well as making boats! - Thanks for all your help.
Colin