how much someone else might pay for it is an impossible question, obviously depends on what it turns into, what the "market" is like when that time comes, and what your estate will settle for

.... don't think about final sale value, think about what it'll be worth to you to own and drive, then get on with spending what's required as you have it to spend
the more you change it, the more it'll cost and the greater the headaches and time involved .... are you a good mechanic? good welder? good bodyman? hiring every thing done on a tight budget will result in a basket case for sale long before it's done .... get it functional and see how you feel about driving yesteryears work machines before getting into designing your own vehicle, cheaper to buy an S10 than build one

Bill