I run a Saito .72 on my UCANDO. Never thrown a prop, don't need a pump or regulator. I have no problems, purrs like a kitten. Hovers about 1/2 throttle. Sweet flyer.

You'll see this in every UCANDO thread but I'll say it anyway, you need to reinforce the landing gear with fiberglass. It is very weak and in light of your firewall issue, it would make me leery not to.

I mounted both elevator servos in the tail and the rudder on a pull pull system in the throttle servo tray and mounted the throttle on its side in the main compartment and mounted the battery over the tank. 6V 1400. Balanced dead on.

just FYI.

GET THAT THING IN THE AIR!! It's a great flyer, you'll love it.