I'm trying to fit a red llama into a small enclosure, but the 1590A seems to be just a hair too shallow to fit a jack over top of the board. I *think* the enclosure that an Xotic EP Booster is in is taller than a 1590A and that would fit the bill, but I can't find one like that. The only other thing I've seen around this size is the 1090NS, which is even smaller than the 1590A.
The 1090NS is supposed to be identical to the 1590A, it's just built by New Sensor not Hammond...
There's a good thread around here for how to fit everything into a 1590A sized enclosure. Do some searching and you should find it.
Jacob