[Spaceships] SM+35 Toroid Station?

[DataPacRat]

I'm planning on doing some plots within a rotating space station based on John Varley's "Gaea": radius 650 km, width 250 km, centrifugal gravity 0.2G, air pressure 2 bars, many more pictures at http://ammonra.org/gaea/index.html . ( http://ammonra.org/gaea/sizes.html shows its size compared to some other space-things, http://ammonra.org/gaea/art/download...1_1152x864.jpg is an interior view, http://ammonra.org/gaea/jmweiss.html shows some interior structure.)

Right now, I'm seeing what I can learn by building it as a SM+35 vessel in Spaceships; I'm picking that size because it seems to match both its diameter and a back-of-the-envelope estimate I made of Gaea's mass. 12 systems of armor and 5 systems of Open Space seem to cover the essentials (eg, 250M acres of floorspace); and throwing in a biotech Robofac for the HT boost, a Solar Panel to power the Robofac, and the last SM+35 system split into hordes of SM+31-and-smaller systems seems to fill out the details. (Eg, a SM+31 Enhanced Sensor Array can auto-detect a SM-10 piece of space-junk at 50,000 miles out, giving plenty of time for some point-defense systems to shoot it down.) Include the Design Features of Spin Gravity, Self Healing, and Stealth Hull; and the Design Switches of Exposed Radiators, Living Ship, Slower Industrial Systems, and Pyramid 34's Armor Volume; and lots of Total Automation to avoid needing trillions of workspaces; and things seem to work out.

Of course, the total price is on the order of $2.6 sextillion, but that was paid millions of years ago, with all the current such stations being descended therefrom. (It looks like it takes the SM+35 robofac 5 years to create a station-egg, if it dedicates itself entirely to that task.)

But I'm only moderately familiar with the standard Spaceships rules, and stretching the tables this far beyond their norms opens up all sorts of possibilities for going wrong. So before I get into some nitty-gritty of figuring out which reaction engines might be handy for ever-so-slowly shifting orbits, I thought I'd pop over here and ask if anyone has any advice on the build. So - is there anything obvious that I might be missing? :)