good points.. i'm going to try and revise it so that i avoid giving the beam a good kicking. i suppose it would be possible to move that beam up to the height that the board drops down to. shoulderroom! hadn't thought of that one!, i was looking at two rows of rungs, so if theyre about 32" wide combined when touching and in the middle, then that leaves more room.
as for it being outside, its that or nothing really so i'm going to get a friend who owns a beltsandallthingsPvC company to make a cover for it.... wont be useable in the rain of course but it'll keep it dry... other than that, well the idea of pre-work training on a frosty morn has its appeal, somehow.
i'll take some pictures once its done. cheers guys, any more pointers welcome!