I don't know if it's correct to bring back to life this thread that has been stuck for several months, however the Minimax was revived by Avsun Aerotechnic , a French company that dealt with technical analysis of materials, which closed down in 2016.... I think they created just one device and I don't think they then threw the whole project in the bin.... even if I don't know from direct experience..... search online to see that the references of this company are still present even if the group is out of order . Having said that, it's a very interesting project...... The origin was the Hiller helicopter.... lots of stuff!
I hope I have been helpful to you in some way....
F. GMT 16.22