I asked him to fix the strange appearance of the smoke exhaustion of the engines.
Right now, it looks like a smoking pipe, regular puffs like the engines have a problem: https://www.youtube.com/watch?v=9ZZQYPZQk0A
It should be even less visible than that (50%) and regular and longer.
You should add in Plane-Maker some more flexibility to create variety of exhaustion.