That airplane kit is better than my 2012 RV-3B project. For one thing, it came with jigs.
But for the RV-3B, I actually did use Lego for something: I wanted a certain "feel" for the canopy latch, and since I had a collection of Lego Technic parts handy, I used those to develop a working concept. Once that was complete and functioning the way I wanted, I made a full-sized version from wood. Yes, a traditional mock-up. After a few iterations of that I made the one on the airplane now, and it works as I'd hoped.
Dave