In reply to pazz1987:
yeah, I've got one like Tonys too.
I live in a particularly wet part of scotland and its done fine in its first year. It's definitely gotten wet at times but for me its saved more money than even driving to the nearest gym, let alone paying gym fees.
Mine is probably a bit steep but I could change the angle if I weren't so lazy. I went for the cheapest currugated roofing available and it's done fine. The edges of the ply do act like a sponge so they are protected with lino that laps into the roofing like roof flashing.
My only issue is that you can boulder when its raining. Phase 2 may include an extendable tarp shelter staked out. I also need better lighting for the dark evenings, rechargeable work lamps?