He wants me to just take over his loan, but I am hitting resistance with lenders.

Or wait it out if they will not cooperate....moving is a pita so don’t be too surprised if they resist, hoping the other side takes it.

Many people automatically think electric resistance baseboards (or electrical coils in a central air-handler), but your ancillary heat could be easily fuelled with natural gas, propane, oil or another fuel.Presuming your use of "furnace" means a forced air furnace and not a boiler and hydronic heat, you have the option of adding a heat pump with an exchanger insert in the plenum of your existing ductwork.  

I am trying to help you, ( I do not want anything)  but you seem to be resisting.

Not to mention the loss of jobs with the robot built houses and the less maintenance needed on a concrete house.I feel there will be a large governmental resistance to them because of what they are going to do to the economy but the cat is out of the Bag.

Sorry, couldn't resist!  

My partner and I own several MH/RV parks in the state of Arizona and are focused on the creation of recession resistant cash flow for our investment fund. 

You could resist it with section 8 after the renovations are complete for more money.

I'm intrigued as to why he wants a high-efficiency toilet (resisting the temptation to make some dirty jokes here), but I would do it if you can vet the plumber he uses, or tell him that you'll provide a plumber and get approval from him for the amount it costs.

That quote seems reasonable but for a little more you could upgrade to more durable flooring that's water resistant and easy to repair.