heres where iam starting

[Superminoh]

ok digging in to look at what i have. i notice of the center stringers the left one is away from the transom about 20 inches, the right one tappers down to the transom like most i have seen on here . is this factory ? got the 150 stack 6 mercury running. so now i can take it off and clean the old plywood out of transom. my question to you master boat builders is ,can you slide plywood in and resin it in if you clean out the transom like seacast advices. 2nd ? i found a distributer for a product called arjay 6011 an y one use this. ican pick it up at fiberglass shop here in houston area for $162.00 for 5 gals no freight.7