In reply to Jon Dittman:
Cheers Jon,
I had googled the idea myself. However, there are loads and loads of indoor walls on stairs, garages, front rooms etc etc. Not many, althought one or two have been informative, projects on outdoor walls and the specific problems relating to them, ie what lasts longest, type of holds, bolts, levered on a pulley to allow a change in the overhang angle or a solid angle to the wall etc etc. Thanks though, fast response.
T