1.
i alway have problem with plane or vehicle tilt left or right and i know how to fix it.but it hard.and use alot of time to find problem and fix.it made you dont want to continue the work.would be great if simpleplane2 have some option button or easy method to fix the problem.
2.
when mirror i want you to remove "mirror fail becouse this part exit in other side"it made more problem then useful.i can use mirror the whole plane but there alway somepart i dont want it to mirror.