The epoxy will get a better "Bite" into the wood if you leave out the CA. Epoxy in place with epoxy on all mating surfaces and clamp. Let set til it sets up and then proceed. Not the time to be in a hurry unless you want to have your plane and engine flying as 2 separate pieces.[:@][:'(] Eventually you will be using the same epoxy to fule proof the firewall but that can wait until after covering. No, that's not in the instructions. Also a good idea to fuel proof the tank area or at least the bottom half of it. A little heat from your covering heat gun will make the epoxy runnier and it will spread easier for fuel proofing.