This is a 28% Edge, not too sure a 160 will cut it. I would say a 50cc gas engine for sure, high torque servos for sure and digital. Depends on how you fly and what you want to do. The firewall is nothing to rebuild, honestly. Seek assistance from club members who are good ol builders.

I would save up some cash and do it right. If you loose the airplane hopefully you can save the rest of gear for another airplane

I have the manual but don't have a scanner, tossed it out a while ago.