The WOF dome worked fine for me, though I will say it requires a lot of patience to cut the things out precisely, and then bending and gluing them. The shapes are such that as long as you join them all up, you'll end up with the right shape regardless.
Regarding the + on top, I didn't end up using it. It served as a guide for the first 1/3 of the dome, after that I just took it out and did the rest freehand. My head's too big and wouldn't fit with it in anyway.
Regarding the glassing, I think you're saying you want to layer the glassing on the inside? Sounds more difficult the more ribs you put in, you'll end up having to work around the ribs. Unless you put the ribs in after glassing, but if you've already glassed the dome, I don't think the ribs will end up being necessary anyway. I'm just guessing here, I'll go get some expert help in a couple of weeks on glassing my own dome.
If you think that's too hard, you can do what some others have done and cut up a batting helmet, or any kind of cheap helmet really. There's pictures somewhere, I think in WOF's template thread. You'll need to fill in the gaps with sintra or whatever else you decide to use. I've no experience with that so I'm sticking with my paper dome for now. But I'm thinking of looking into a BMX helmet for my next one.