Hi Caramel
I don't really have useful advice but can tell you the problems my Dadand I have found with the run we made - that may help. We'dlove to hear what wood you eventually use as we used a soft untreatedwood from Wickes. The run was cheap to make even though itwas about 6 ft by 4ft but the wood is so soft that our Bugsy shreds it!It's untreated too as I couldn't find anything I was confident would besafe so it was never going to last that long.
Oh well, you live and learn. The other issue is thetop-I cover the run with a builders plastic sheetand find that the rain gathers on top so next time the run will have aslightly sloping top.
My run is quite high too (about 3 ft or so) - the height means I canbuild up play areas in it and Bugsy can stretch right up high, but it'sa bit of a pain when you've got to clamber into it in your dressinggown each morning! Good job the neighbours can't see into my garden -they'd get more than they bargained for!
Can't wait to see a picture!