Here's a thought for covering, take a look at Balsa USA's solartex. It is a fabric covering, unlike Monokote. It comes in olive drab and once you put it on and tighten it stays. it's great for around curves. I covered my 1/4 Scale Cub in that fabric when I built it 4 years ago and I have not had to tighten it up anywhere, and it sits in a basement all year long.
Check it out, you can get a 5 meter roll for $35.00, you'll probably need 2 rolls.
Thanks Tom