When I built my CVA kit, I had to add a recoil pad to extend the stock long enough for a close LOP for me. I didn't like having to use a modern recoil pad on the gun, but I didn't want to try to fit a wood extension to the stock, as I had nothing that would come close to the grain on the wood(?) used in the stock.
My plan is to fill in the missing wood spots in the barrel mortise, and send or take it to Dick Greensides at Pecatonica River, Rockford, Il., to have him use it as a pattern to make a new stock from Maple or Walnut, and put a more traditional steel buttplate on the stock. I am not thrilled with the wire springs in the action, but the gun has shot well over the past 20 years I have had it.