They had a pet expo here in Reno a year or so ago and some guy was selling those things as pets for about 200 buck a piece. If you want to keep them I would think something like an oversized bird house would work.
ME. Know HOW I know? I EAT B!!!!!$ FOR BREAKFAST. Had to...lolol If you get a 5 gallon bucket w a lid, camouflage paint it, mount it in a tree, and cut a hole in it..they should make a nest and call it home. That's what I've seen done for regular squirrels
Where there is flying squirrel, there is moose soon to follow. Let squirrel pass, wait for moose, shoot moose. Much moar meats on moose ! Moose starts with Mmmmm.