I also use CA on the engine mount holes to reinforce the wood around them, I use CA on all the holes in the Reaction, all, from engine mount to retracts mounts ( I don't use blind nuts on retracts, nearly 30 jets build that way ) to the control surfaces and more.
I here you Alan, I can assure you and second what the guys are saying about the longevity of the wood/metal screws on the plywood mount.
Thank you for your suggestion.