If you are just looking to use the Kadet to break in the motor, unless you start doing loops or high G manuvers, i think the Kadet wing is strong enough for a .60 sized motor. If you would see how i fly my Kadet you would understand
It gets used regularly as a plane used to introduce new kids to R/C & has used up 8 of its 9 lives allready. Never had the wings come off in flight ....YET...GENE
PS, i'd reinforce the firewall area though