Well the kit was a limited run licensed Exidy product made by some members here. Basically what were made is all that were made and or will be made is how I understand it. I can't clearly recall but I think the boards sold new for either $275 or 375. So not a cheap board to begin with. Since they were limited and are now sold out their value is of course now more than they originally sold for. As for the shooter itself the values can range. basically chiller, crossbow and cheyenne were the most popular titles so their value is based on popularity. The other shooters are not as good games but fewer were made so they hold some value due to rarity. I would say you might get an exidy shooter anywhere between $600-1200 depending on title and condition. Add the value of the kit to that and I would say you price range could be anywhere from $1000 to 1600. Possibly more.
I feel I got lucky when I got my non working cheyenne. Don't recal what I paid for it. I think possibly $450 but I may be low on that estimate. Anyhow it was a good price and it's one of my favorite games.