Great work and tips!
I found the secondary hull warped without an upper support. I also had to add interior supports to the fore section of the secondary hull, behind the deflector, to retain the shape of the fore hull as well.
Your pylon support idea is smart, as was the nacelle support. These too will warp.
Thanks for sharing these ideas and the way you made it work!
This is a cool idea for a kit, but the actual build was a bit challenging. Your ideas are great suggestions.