I've been working on a replica of the Sterling Schweizer 1-34 kit from the 70's. I built one their 1-26s from the same era. It wasn't easy to build with all of the stringers and curved sheeting. And I don't recall it flying very well. This was back in the 70's when these kits were "new". I got interested in the 1-34 and found the Outerzone plans online. After some study I decided it wouldn't be too hard to build if I made a bunch of modifications based on building sailplane models for many years.
It's kind of a standoff scale approach. All shapes and outlines are the same as the Sterling kit (mostly, there are a few variations). I also wanted to build it light, so, most design decisions are in the direction of reducing the weight as much as possible.