Arright, an announcement:
My gym is ready and rearing to go!
I've picked which attributes the gym is going to have, and here is the tl;dr:
I'll edit this in to the OP.
Also, about gym difficulties: this first round of gymming (a nice verb I've just decided on) was always about working out how hard to make everything. We decided to err on the side of caution, and that we'd look at it to see how it works afterwards. As it is, they do look too hard, although I don't feel that lowering it too much would be that good an idea. But we'll think about it later and work out exactly where they need to be, once we look at how each gym went.