I here what your saying, GLaDOS.
But I can see where the construction kit will be a great tool for people who don't model.
From the latest video that TGC shown on the web site, And in the word of the developer, is that basically this is the same as segments in Classic. The reality about segments is that they are nothing more then a bunch of entities, grouped together in a file.
The same thing in the construction kit. You have a top level object that may have 3 to 4 pieces in it to make the whole thing. The real advantage is that you can unsnap from the grid to get that offset that you really want, for custom stuff. This is nice for people who don't model, and gives them more freedom for creation without being stuck in the box look of things.
Personally, coming from an architectural background I like the option to use this tool to build up partials of a structure, but I am liking the real freedom of building my scene in the model program and exporting sections of it to reloaded and seeing that for player movement it functions just fine.
Example Below:
Objects Test in FPSC Reloaded Beta 1.005. 160,000 polys in 56 objects.
Buildings and Stairs are one object. Floor and outer walls another.
Mountain shell was set on the terrain and then I built up the terrain around it.
Started the test level and went into edit mode and cut out the terrain that overflowed in to the mountain. Pretty cool with some patients.
So as far as indoor games will go, I can easily see lots of play time inside this structure, and it can still have 4 or 5 more floor, plus the basement.
The only thing I am concerned about is how the NPC will react to walking around these structures and functioning proper.