I'm having a hard time finding contractors who can handle the framing portion of the project (flooring joists, laying subfloor, walls, roofing system) who aren't also general contractors.

Once I closed on the property I started to tear down the walls and notice that had no insulation, at that point I decided I going to tear  everything up. when I took the sheetrock from the ceiling, I was in shock to see that some electric work was done with duct tape. 

For example if there's a door connecting their unit to your unit you would need to either wall that off or replace with a fire door and keep that bolted. 

The biggest walls holding us back are usually in our minds.

I may be wrong, but unless you are modifying square feet, you don't need to pull permits inside the 4 walls, unless you're doing electrical/plumbing?

I can do dry wall patches and install sink faucets as well

:1) First, buy the land and a mobile home within 60 days of each other and have the mobile home moved there, keeping the hitch and axle and wheels in place 2) Second, get a perimeter wall or concrete pillar every 8 feet built under the  frame of the mobile home.

The next stage would be to install sheetrock on walls and ceiling, waterproof bathroom walls and install tiles, finished flooring, new kitchen cabinets and appliance, install bathroom fixtures.The problem is time. 

The minimum posting requires that a notice be posted in a conspicuous location on an interior wall and must include all required information.

Same for windows, doors, relocated walls, and so on.