Gandalf's Slave ,

I haven't dealt with an ARF myself, but here are some things to consider before you finish it:

Your pictures look like the engine and fuel tank area might be bare wood. If so, you should coat the bare wood with epoxy or some other fuel-proof coating. If it's not already done, it's good to strengthen the firewall-to-fuse, the landing gear block, and the wing hold-down blocks with fiberglass and epoxy. If they're competently assembled with epoxy already, you might be OK to leave it.

Give the control surfaces a little pull to see if the hinges have been sufficiently glued.

Check the air in the tires