One of the main problems of finding a place to work on buses is caused by zoning. These are the regulations put in place to prevent certain activities on private property. Different jurisdictions have specific zoning codes like M1 M2 ect. for manufacturing. This would be fine for bus builds. R1 R2 is residential and this will be a no go. C1 C2 is commercial and is primarily for retail sales. Minor bus mods and repairs might be okay. Then there is a few and I mean very few places that do not have any zoning at all. I live there. Yes we are still free! The main problem with that is if I want to start a pig farm I may have to do it by some nice houses.
Then there is the matter of enforcement. Some places are very strict and others are lax. Like most of southern NM. If I were you I would look to West Virginia. It is close to you and the state has some very nice people in it. I’ve been there. WV is also a poor state that has lost a lot of their jobs and you may have an easier time finding someone that wants to rent to you at a reasonable rate. Without getting political, politics does have a huge bearing on the level of regulation, so research that too.