Currently it is very buggy and laggy, but I’m working on it.
I have quite a few pictures if you prefer not to join.
More to come 
Once I have access to scripting the CSG Editor It will be even better!
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Me and Cr3470r actually had a project which was just this. We attempted to create both a haunted house that was bigger on the inside and a tardis. We did it slightly differently to you and actually did some very smart manipulation whereby when the user walked through the door they were teleported into the actual tardis and used some funky math to make the camera appear outside if it were outside, or inside if it were inside.
Hmm, maybe you could send it to me? I’m going to try to make a game around traveling through time and space. If you have any tips on how to do this better PLEASE let me know. This is all very very early work on it.
Not to toot your own horn or anything. 
It all depends on if you want users to be able to view the tardis from the outside. Our version had to have the doors closed since the actual interior was empty, it was an illusion we created. There’s also a viewing window and you can calculate what the user should see using this. I imagine this is what you’re currently doing. Really, there are many ways to achieve this. Infact, this is what we did except the door didn’t open so we didn’t need to worry about showing the inside.
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Yeah, that is what I’m doing. I’m just trying to figure out how to show all of it once they are inside.
You want to focus on where the camera is, not the player. The camera is what they see with at the end of the day. It shouldn’t be too difficult to work out when the camera is inside and when it isn’t, since at some point it will have to pass through the doorway.
Yeah, I was trying to work that out.
I love the badges, haha.
(You can remove them from the game by going to their page and hitting delete from my inventory)
Games like The Stanley Parable, Portal, etc. that use this kind of camera/game world manipulation are able to achieve it in such a way that the illusion is almost entirely flawless.
My question is, to what amount can you achieve this effect on Roblox? I have no idea how real developers do this, but I would assume that it would be quite a bit more difficult using Roblox, because creators are limited to pre-existing objects and can’t edit them on the fly.
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[quote] Games like The Stanley Parable, Portal, etc. that use this kind of camera/game world manipulation are able to achieve it in such a way that the illusion is almost entirely flawless.
My question is, to what amount can you achieve this effect on Roblox? I have no idea how real developers do this, but I would assume that it would be quite a bit more difficult using Roblox, because creators are limited to pre-existing objects and can’t edit them on the fly. [/quote]
It’s entirely possible, we just don’t have the power required to do so. It’d be extremely slow and laggy.