There are some manufactures that will do some modifications without it costing an arm and a leg. Tiffin is one that comes to mind.
They allow their workweek to do after hour modification using Tiffin equipment. If I remember correctly you pay the workers time and Tiffin for any materials they use. It has to be approved ahead of time but it's a win win for everyone.
Some things they will do especially if it's done on one of the subassembly lines and not the main production line. Changing out a piece of furniture or equipment or modifying a cabinet comes to mind.
So it can be done it just takes the will to do and good planing. I for one am willing to pay for some custom mode that are better done during the initial build.
I'd like to get some CAT cabling run to various location such as the roof and HDTVs along with some conduit for adding solar and twoway radios cables to the roof. However if I can't I'll figure out a way to do it later.
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