That's a good point, I never thought of access on balsa. I had a Goldberg Lightning Bug and it had the same condition (remove wing for battery), I brought it back thinking I would trash the balsa. It looked like a nice flyer though.
What I like about the Super Impress is its size. It seems to be big enough to be able to fly in more windy conditions than Beaver.
That has been my problem with the p51 too. It's been a windy summer so far and it looks like it's getting worse with the ammount of hurricanes we are expexted to get.