Several of the concepts above are exactly what Newmar and Tiffin will entertain...for customer customization. These are the boutique builders I mentioned. They make only a fraction of the RV's made by companies like TMC, Forest River, Jayco and Winnie.
And, I submit that the 40% higher (average) price that you will be looking at with these brands IS unreasonable. That's just personal opinion.
The real problem that the buyer will encounter when trying to make the final price deal at the retail store is...once you put together the custom order and get a preliminary factory approval of the concept (done at a dealership)...the only way to barter a better price below MSRP is to leave the first dealership and go to another dealer...then attempt to play dealers off each other. This reportedly can work, but I am skeptical.
If you are willing to pay the difference, more power to you. I am not.
I have done my mods, including wiring, by DIY and the aftermarket.
Like I said earlier...me and my wallet much prefer TMC's business model.
Safe travels
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