First: I'm a longtime lurker, occasional mapmaker, but not an active poster until now (hopefully ) I'm trying to take my map-making a bit more seriously now; I've a fair bit of free time.

In any case, what would this community suggest as the best way to approach mapping the inside of a multileveled sphere or cylinder (a space ship) with several layers of bulkheads and various stuff built into the walls (hatches etc.). Ideally, I want to keep things as precise as possible and keep my lines clean and symmetrical. I have Autorealm, Photoshop, Illustrator, and Sketchup 7 to work with (though I am not at all fond of the latter). Thanks, all!