I quite like the use of circular rooms in your vaults.

Not sure about cool, but a few ideas:
- an empty vault with nothing in it
- under construction vault with half finished rooms and minable blocks in rooms
- vaults with 'modern' appliances (as in others found the vault and modernized it)
- vaults inhabited by a dozen+ random xenotype ancients
- toxic vault, vault re-purposed for toxic material storage

As for vault layouts:
- a vault with an internal river or lake to mimic self-sustainability
- Cheyenne mountain complex; a long driveway into an enormous mountain vault
- a big single circular vault with a large open centre space and rooms against the outdoor walls
- if at all possible, vaults with open space (eg. to allow a chopper to land in the centre)

Right I like a few of those ideas. For the very last point, I have several vaults with space for helicoptors, SRTS, and even one with a runway for aircraft!!

a vault from 40k

U should make a vault that has a big gun room a room of aircrafts and tanks or cars and a last stand room for if u get raided

MMm I could make a 40k themed vault, but if I wanted to use 40k mods, I guess I could make grimhammer mods a soft requirement.

Otherwise, I have maps that are suitable for tanks already, and as I said, one of my maps has an air strip.

I'll second the toxic vault thing with a nuclear waste storage vibe. The ancients are the custodians of the material and has to make sure it doesn't leak out.

You might do a prison vault where political prisoners were held, but the records have degraded. If you need more people, do you take the gamble of opening one of the caskets?

Not sure about the possibility of cross-mod interactions, but the Wool series of novels made me think of a vault whose design is self-sufficiency on top of an oil well. I'm thinking including a VCE deepchem deposit and machinery for refinement.

(Running a overmodded run with Redwood on sea ice right now and having blast doing so. Keep up the good work!)

a mechanitor vault

A prison vault was one I was planning, and also I have had a few people asking for one! I'll probably do that next.

A mechantor vault isn't a bad idea either. I'll add that to the list

i have a idea do u know the forerunner from halo because if u do than u should make a forerunner vault

I mean one of the vaults is an archotech vault. Which isprpetty close in concept? Its absurdly over powered so I wouldn't do it again.

ok

could u make a gestalt engine vault and it does use the gestalt engine mod

If possible, I really try to avoid dependencies. Also its a mod I've never heard of before

oh ok

I have over 2000 hours in it, so you could say I am unfamiliar