LOL no worries hayden...I will try not to Anthonise it too much (thats me Anthony).
Ok first off you really do need (construction views mate) pivot points of weight bearers...ie every 10 to 20 metres SHOULD be either a column from top to bottom to take the weight of the planks..ie bridge...with me so far? if not I can bash out a 5 min example.
Shit..Jay I hope this is ok helpin out here?
second : for both water run off and basic 'lets not roll out the door over the cliff' the planks should have a lean towards the cliff face...so if you staggered out pissed and fell over..you would roll back towards the cliff face.
third: to dissapate the water run off...right hard up against the cliff would be a gutter (same as the one on your roof) this would take the water to the end of the row..either to a tank on every floor (for water) or to a resovoir at the bottom..which would then need a bucket/winch for everyone to share the water...or you could use a corkscrew gadget like they did in ancient Egypt.
This would of course mean that either every level, will have a slight fall from left to right (or vice versa) or the floor will be flat and the gutter itself will have the fall.
Have I still got you??
"A Darkness at Sethanon", a book I aspire to model some of the charcters and scenes