I think the allure of
rba's is that you can set it up the way you like. Common mesh for wick is 400x400 or 500x500... people seem to be playing with metal rope these days for wicking....
common wire gauges are 28g, 30g, and 32g... kanthal a-1 or nichrome... people are also playing with kanthal ribbon wire.
I think a pretty good place to start is 400x400 mesh and 32g kanthal a-1... that's a pretty safe bet.