Hi Bud,
In most places in Maine it's generally not a problem to put a mobile home on land while you're building, especially given the acreage you're planning to buy. You'll just need to drill a well and install a septic set up first, since I can't imagine that Perry has a city-wide system. It would be best to contact the
Perry town office for specifics, in case they're the exception that proves the rule! It looks like
Harbor Homes is a modular builder in that area. If they can't help you, I'm sure they can tell you who can. I don't know why a stick built would be any more of a pain than a modular home, since it's not like Perry is on one of the islands. Any construction company that works in that area is probably used to travelling long distances, if that's your concern.
As for your other questions, a real estate agent from the area would probably be most helpful.
Good luck with your build :-)