I have to respectfully disagreeon auto maintenance being used as a gating factor about building/rebuilding a TTT.
Now, as a disclaimer up front, i am nuts - i do all my own home and auto maintenance, as well as rebuilding antique cars as a hobby (the camper is towed by an antique, of course...

)
I find the two to be very different skill sets - rebuilding my TTT from a gutted wreck used mostly woodworking/electrical/sheet metal, and other than the axle repplacement wasn't really a mechanical process.
if one were working with a bought-in chassis there's really not all that much mechanical involved that a typical homeowner doesn't do in maintaining a home.
Definitely not the same skill set in my opinion...
Alan