I managed yesterday to get the mockup ready for a low weight sit-down test. The difference between a model and a mockup is huge: A full sized person should be able to enter, sit down and exit the mockup without breaking it. You have to make the structure strong enough to take-up the load of an adult (100 kg or 220 lb). I started today in the morning with lower weights. I hope to be able to sit down myself soon—without rupture of the mockup and myself.
Here are some videos of flight testing the 1:4 prototype
Flying together with a milan: