Mysterious Galaxy

Putting everything back together was altogether different. I found a solution pretty quickly which got the pieces back to what appeared to be their original positions in the frame. But I knew it wasn't the right solution since it took me quite a number of moves to take them apart initially. I checked the solution with Burr Tools and found that I had used the easiest of 4 possible solutions (just 6 steps) which probably wasn't intended. The more difficult solution takes 20 steps to get that first piece out.

Petit

This one I found less difficult than the Cockpit. The Petit is made from Cherry (frame) and Paduak (pieces). Consisting of just 2 pieces interlocked within the frame, it was a much easier task trying to remember the moves, which were also far fewer than Cockpit. I managed to disengage and later assembled the pieces without the aid of Burr Tools. I would think that for Petit, even with a trial and error approach and persistence may achieve the desired result, but not the Cockpit.