A total camper rebuild is an undertaking. We have had a few folks do this and they have come out very well. The time length of a year is a good target unless your retired with time on your hands. And even then it may take a year once construction starts.
Amazing how much time one can spend working on such a small space...
I myself may do the "ultimate mod" of a rebuild of the camper from the ground up. It is a retirement project goal. Not there yet... but getting closer. It will either be that or to buy a new one. There is only one brand that comes close right now for a buy new and they are made in Oregon.
In my case, it is a total rebuild, outer frame, walls, siding, roof and all. Basically build a new camper. I'm still sorting out if I use my existing frame as I have upgraded the running gear so much that it is hard to get that strong of an RV frame from the Surplus places.
The weight and balance is a concern as was mentioned. If you are into math, you can create the correct balance but you need to do every object in the camper. Again not hard, just a lot of time. In our case we actually like the floor plan we have but would make 2 adjustments, I would gain 6" more inches at the end of the bed and the bath about 6" longer and a neo angle shower. This will add 1 foot to the frame.
In my case I have access to drafting tools to layout the entire camper in a computer so I can see it all fits. Don't need the computer but it helps. Grew up on a drafting board and it worked a really long time before the computer came along.
You do end up with the quality you want and the plan you create. It will take research and I continue to learn more all the time. If you are anywhere near Elkhart IN there are RV surplus places you can build an entire camper out of no problem. You just need to hunt for and maybe compromise on some things, or buy direct from the factories if they sell that way.
Getting paneling can be a challenge or again a compromise to what you can find.
If you keep the majority of the existing floor plan you have now and just do a face lift of new wall board, new cabinets etc built in the same RV methods, your weight and balance is less affected. If hubby is an electrician by trade, trust me there is no issues with the converter or the electrical system. A camper is basically wired on the 120 VAC side like a giant rolling appliance.
Lots to think about, plan, lots of work, but can be lots of satisfaction and fun.
As far as the money part, this one is your choice. Anything we do with these campers is for enjoyment. How each of us choose to spend it, is up to those spending it. I really do not want to add up the amount of time I have in my own camper in upgrades or repairs. I would be working for pennies..... But I enjoy the work, with my hands, my head and then go camping in it
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If money is priority 1, a heads up, don't get an RV...
And if your handy, it is a whole lot easier to do these kinds of things.
Good luck and take pics.
John