....the total estimate goes beyond the actual market value of the plane...
About nine years ago I spent at least 3x, maybe 4x, to fix up my plane beyond it's actual value. I kept the plane and have flown the pants off of it (not wheel pants) and I now consider that I got my money's worth. If I ever decide to sell, I know I will never get out what I put into it. Not even close.
Yesterday I filled out the annual Santa Clara County tax assessor value statement thing-a-ma-jig paper. At least the county can't put a high property value on the plane to tax me.