Originally Posted by catinmoon
Any ideas about what % of modification costs would be a reasonable sum to offer? My initial instinct is 50%, but I'm open to ideas.
I would do comps based on Sportsmobiles as nearly equipped as the potential purchase as possible.
Add price if the comp is older and has more mileage, or lower quality furnishings and modifications.
Subtract price if the comp is newer, has fewer miles and higher quality furnishings and mods.
Trying to figure cost based on their cost doesn't make sense for you, while it might for them. Figure cost based on supply and demand. If they want a lot and you can get a better van for less, do it. If the same kind of thing is more expensive elsewhere then buy theirs.
Main thing is do you like the layout and the power plant. Those are the two things that are exceedingly expensive to change.
If I tried to sell my 1954 Chevy pick up for what I have invested in the thing people would laugh in my face. That is one reason to buy used. It is almost always cheaper to buy someone else's custom ride than make one yourself.
Also: Go to Sportsmobile.com and click Pre-Owned for a good idea of the high end prices of vans currently for sale. One thing you will notice is that 4x4 versions hold a much higher value for much longer than do the 2WD versions. That is why we bought a 2WD and had Agile Off-Road do the conversion. We now have a van that is worth, comparatively speaking, more than we paid.