I was messing around the game and i discovered that if you put the length of glass fuselage in a negative number it will shine from the inside, not the outside

You know in the normal glass fuselage if you zoom in inside of it the inside would appear invisible, but if you put it's length in negative the outside will be invisible and the inside will be visible

example

fuselage length in normal (positive) number:

fuselage length in a negative number:

but there's a problem.

If you put the num in negative like i said the outside will look invisible, so you can't see the plane's cockpit glass if you wasn't in cockpit view

So to solve this problem, make 2 glass fuselage one with positive length and one with negative length and put them in the same position (inside each other)

So you'll be able to see the glass from inside and from outside :)