I’ve long dreamed of having one of these for a house! However I think that in reality the house would own me. Most of these missile silos were insulated with asbestos - you can work around that but I think that is well beyond a typical DIY project. Ground water penetration would also be an ongoing concern, you have to be vigilant and deferred maintenance would catch up to you quickly. Any maintenance issues that can’t be resolved internally and require digging down from above would be costly. Typical home warranty probably won’t cover anything.

But for a few years it would be really sweet just the same! Just expect it to be a depreciating asset going in.