Well, for each screw pump, you're going to need three units of wood (one corkscrew, one block, one pipe). You'll need four wood for each windmill or three for each waterwheel you use. You will probable also need some for axles, but how much will vary based on how close the power source is to the pumps.
The perpetual motion power supply used on the wiki video is a very good one, but be aware that the pump design as written won't work anymore. Now you've *also* got to lay channels on the other side of each screw pump, which allow you to absorb water back into the aquifer. Once you do that, it'll be fine.
Technically, the project can be accomplished without any stone at all, but you'll need one mechanism for each gearbox you use, either to transmit power or to shut off with a lever (which takes three more). If you want control over your pumps, that means at least four mechanisms (gearbox, lever, and two connections), possibly more if one axle won't cut it. I'd bring at least ten, just in case you need them.
LOL about the river. Big river = more awesome. To access the middle of the waterfall cliff, you could build a 3-wide path or arch across it, (bridges alone won't work, they don't support construction) but we may need a temporary entrance to the fort in the meantime. if you really want to use bridges, you'll have to make walls or floors on either side to support them.
code:
Arch schematic, if you're as paranoid as me about the 7-tile cave-in code going back in.
_ = Floor
O = Wall
/ = Ramp
~ = water
| = bank
= = ground |-6s-| ______
_____/O O\____
..____/O O\____..
|~~~~~~~~~~~~~~~~~~~~~~~~~~~|
Do however many layers of six tiles gets you across.
EDIT: Oh right, down. Uhhmm...the arch would still work, You'd just need to build it ascending in one direction and place the bridge at the top of it.
code:
Revised arch schematic.
_ = Floor
O = Wall
/ = Ramp
~ = water
| = bank
. = ground
= = bridge|_ |/
:_ |\ <- Wagon access ramps (not to scale)
| ====O\____ |/
| O\____ |\
| O\____./
|~~~~~~~~~~~~~~~~~~~~~|
[ March 30, 2008: Message edited by: bigmcstrongmuscle ]