After i viewed this post, I was thinking about the applications of that glitch... and I realized that it has an error (which is kind of ironic considering it shouldn't be in the game...)

That glitch is:

*The hollow fuselage block is actually a 100% opaque hollow glass, with a non-hollow glass block in it

I thought, this could make windows with very few parts! But the problem is that it only works on the inside of the hollow glass, i.e. it doesn't do anything if you look from outside the plane.

And if a part is added that makes the hollow glass and fuselage look like this, but both inside and outside?

Here's the suggestion!