You can do all sorts of wacky stuff. You can also use changing partype to make fuselage into hollow fuselage (and vice versa). This is also great for reinforcing wings by making primary wings into structural wings, but at 11k I'd assume you already know this.
Using @Eggplant 's method, but you have to re-connect the part after changing them
No
xml it to the glass varient
You can do all sorts of wacky stuff. You can also use changing partype to make fuselage into hollow fuselage (and vice versa). This is also great for reinforcing wings by making primary wings into structural wings, but at 11k I'd assume you already know this.
just change partType to
Fuselage-Glass-1(2 for hollow)yes