This is a really awesome mod! I do have a few suggestions that could make it even better...
- Like others have said before, it would be great to be able to have more than one module, either in higher tiers or by crafting a new slot to be added. For example, it would be nice to be able to have a speed module and a fuel efficiency module so the cons can counteract each other.
- Have the fuel and module stay in the airship when you break it.
- An off switch so fuel isn't wasted when it's on the ground.
- Parachute for if you accidentally dismount high up in the air. (Not that I've done that though...of course not... >.>)
I also see that you have Forge energy planned for the future. That would be fantastic!