I Build more a Yak 55M, but this came with some modifications that I think have improved the plane. And I suggest that is implanted in the assembly design of the next aircraft.
1 - One problem the project has always been the weakness of the landing gear. The depron bar has been removed (always breaks even), and was assigned a new lock of the landing and anchored in the same point in support of the wings. And in tests (forced landings or controlled falls)the landing gear resisted good. And finally, although not shown in these photos were also taken from the leggings, are cool but...