MY first thought is a Quazite box:
http://www.hubbellpowersystems.com/about/quazite/
Thanks but I haven't seen any cutsheet of boxes from their size...
To digress a moment. I'm curious as to your conductor arrangement.
Sounds like a derating nightmare with the 2" conduit.
BTW, I'm on a kick lately regarding overloaded small conductors because I've run into many of them recently. Most were cooked.
At the same time, if this is the same project you mentioned in the earlier post re: Christmas lighting, I am wondering if you're the one who will be installing the Christmas lights? If so, you would be able to supervise the load distribution. If not, would it make sense to undersize the breakers to more closely approximate the derated ampacity of the conductors?
BTW, I'm on a kick lately regarding overloaded small conductors because I've run into many of them recently. Most were cooked.
How's about keep 20A/1P breakers and use #8 wire for derating purpose sound?