I found a new way (at least to me) to keep large things rigid without mods or craft file editing. Meet Brutis
This dude is fing massive (slightly larger than the sph) and honestly flies really good. Only problem is if you take it above 250m/s it rips itself apart, have fun with that. It has the ability to save the crew, land and carry cargo what more do you need? It can carry about 750 tons and still take off, 800 if you strap rockets to the side and pray. It also can climb nearly straight up under full power, and carries enough fuel to fly for nearly 6 hours when cruising. If you need to get something from one place to another this is the plane to do it.
Keys are
1 - lights
2 - ladder
3 - thrust reverser
4 - shut down all but cruising engines
5 - open back door
6 - open back hanger
7 - open front door
8 - open front hangar
steam link with more pictures
https://steamcommunity.com/sharedfiles/filedetails/?id=1565539532
and here is the craft file
https://drive.google.com/open?id=12-asM-do7sFjT0I6UhvIL8Hsgjrt0g8a