Ok, I am going to build a run-off shed and need an idea as to how to make
the slide-off roof slide off, without being flimsey or too cumbrous to move.
Is there any one here who has made one and can give me some tips, on what to
do/ what not to do?

I looked in the first edn. of Moore's book on observatories, but that does
not tell you HOW to make a run off roof, run off. It has plenty of images
of people's observatories, but little on the technique behind their
construction, and it that which I need!

Any help would be greatly appreciated!

Martin T