Use this mod to get the interiors: [Dev] Doomsday/Smugglers Run Interiors/Props/IPLs/Teleport
Then after you installed that you need to install a teleporter so you can get to the interiors. Then you you this [RELEASE] Interiors teleportation with GUI | 1.0.0
Use the coordinates from the interior mod and put them in the teleporter config. Good luck! @C0ffe