You make a very good point, and I'm afraid my answer isn't very exciting. Having the corridor segments equally sized makes the modelling process easier, because if I'm drawing a 64 sided circle I get 64 equal corridor segments. What I do is make one segment, and then copy/paste it 64 times in a circle. Plus, because they're linked together as 'components' in Sketchup, any changes I make to one is also immediately reflected on the 63 other segments. It speeds the process up considerably
My original plan was to recreate the Stage 9 set in its entirety, and then chop it up and use portions of it as required around the ship. However, because each deck has a different radius every circular corridor has a varying degree of curvature. So, despite being the lazy option it's a lot easier to use equal sized segments, that way I can have corridors exactly where I need them and I know they'll fit perfectly.