Everything is selling slow right now, especially hobby stuff.  I have a few other interests, and prices are down quite a bit with that stuff too.
But the only way to know what it's worth is what someone will pay for it.  I'd never pay more for a built bike than the parts cost to duplicate it, regardless of the labor involved.  However, some might just want a "turn-key" deal.
Something like this is very unique and 0ne-of-a-kind.  If you find the right person, it will sell immediately.  Otherwise, you might have to discount it severely to sell.