When you can find someone who shares your vision for what you have done with this cab and chassis, and is ready to pursue it to completion, then perhaps you can establish what that person is willing to pay for what you have done.
There is no way to establish an "objective" value for this kind of project. You will know how much money and time you have in it. Someone may be willing to pay for something for it. "It's worth what one will give and the other will take," and when those two figures come together, that will be its "value."
Someone may think that it's just the kind of thing they want. Someone else may want nothing to do with it. i daresay that there's no "middle ground."
God's Peace to you.
d
Inliner #1450