Museli, I don't know where you get your info from, but diamond waterproof pipes don't exist.
And if you are worried about pumping water along with oil, just build a tower around the geyser, so it only pumps oil.
Flatification? You sure you want to do that on a flat area?
Or you could pick the arrays up and connect them through a cable, though you still might want to use a different blueprint.
Server side: 0. I haven't even played on a server, not to mention creating one.
Game side: I don't now, 9? Mastered IC2, BC, EE, RP2 I know a lot and railcraft is pretty strong too.