Please don't use the stock motor mount! I have 2 lasers and the first one is with the supplied wooden mount. I run the laser with a .72 and after about 3 months of pretty hard flying the vibrations finally started to get to it and the top edges of the mount which is inserted into the firewall started to vibrate loose. The mount was slowly working itself loose out of the slots. I re-epoxied this and it kept up fine with added triangle blocks between firewall and mount, but on the second plane I installed a Du-Bro mount. I installed a 1/8" light ply firewall doubler with the center hole for the tank and the fuel tubing holes cut out. This gives more material for the blind nuts to dig into, and also toughens the firewall.

Just a suggestion