I think about $600.00 to about $700.00 would be a good price for the barreled action and forend or forend parts - just needs a new butt-stock is all. I believe they are reaching a bit high with that $1,100 price, expecially with today's market.
I am not a collector - just a shooter, so can't help with collector value. I can say that with that butchered stock, it has little to no collector value as the stock must be replaced in any event if one wants to 'fix' it.