I'm glad to hear good things about the Zero's flying ability. The only Red Box I've built before this was the Mustang, a real carver's special, which came out heavy and flew like a rocket throughout it's short but glorious 2 flight career. To be fair, that was way back in '88 and I was trying to jump from a Kadet Senior(!) to that hotrod Red Box P51 warbird.
Don't know about building these vintage kits for fun though. Aside from investing a $200.00 collectors item,there can be extra work sometimes with 20 year old balsa, and the plans don't show near enough to scratchbuild from. Probably the way to go is to dupe the parts with new balsa and put the originals right back into the box.
Wish I'd thought of that 2 weeks ago!
Thanks all!