It will be added. You can currently put interiors in your map, but interior lighting isn't good. Outdoor lighting isn't good right now, either, LOL! If you are talking about assembling segments to make interiors as in Classic, That will come in the upcoming conkit, albeit differently than before. You can assemble interiors out of "segments" on your map now, just not the ones used in Classic. The horror pack has pieces that you can use to see what I mean. (I assume you have that, they're in the "buildings" category) At least I think those are part of the horror pack.
MAME Cab PC: i7 4770@3.4Ghz (passmark 9945), 12GB RAM, Win 8.1/64, GeForce GTX645 (passmark 1898); Shiny new laptop: i7 4800MQ@2.7Ghz (passmark 8586), 16GB RAM, Win 8.1/64, GeForce GTX870M (passmark 3598); Old laptop: i5@2.3Ghz, 8GB RAM, Win 7/64, Intel 3000 graphics
