As in having your sump out there, or just a drain from the tank to the side yard that you could drain water change water and a skimmer to?
I picked my large tank location based on how easy it was to get to the house drain to make maintenance easier. I haven't seen people with outdoor sumps before, if that is what you are thinking of I would love to hear more about it.
Outdoor sump and sump based equipment is what I was thinking about. I'm just not sure how practical it would be to try and insulate it from both temperature and critters. We have an insane black widow population at this place. It would be the perfect area though, maybe gets an hour of sunlight but then is shaded the rest of the day. It's also all cement over there. It has drains but those are rain run off to the gutter so I wouldn't want to be sending my tank water down there.
This tank will be near a window so if I do need to drain/or water change every once in a while that won't be too hard if the sump stays inside. I dont do regular water changes, specially on a larger tank. I feel the bigger the tank the more programs like reef moonshiner trace element programs start to pay for themselves in salt costs.
I feel like I saw someone around here with an outdoor frag section and sump. I think Jimmy had his outside too, I'll have to figure out how to hit him up and see what he did to insulated it and if it was worth the effort. With a herbie I'd imagine it would be close to dead quite though. That'd be nice.