You can't go wrong with a Saito, they were my preferred engine for my glow models. A 1.25 will let you hang that clipped wing on its prop if you want, I've seen several 1/4 scale Cubs fly just fine on a .90. You can get Saito's that use gas, if you decide to go with gas.

I'm not familiar with "Neucover" material, is it like Solartex or more like Monokote?. All my fabric skinned planes were covered with Sig Koverall, doped and painted. It might be a bit more work but it is very durable.