ok, just watched the scenes again and yeah, i guess they do actually loop around the core and go out the same way the came in (at least that arguement could be made) but the part they go in/out of doesnt appear to be the barely completed section as it looks to be the surface...also, the schemetic/holo of it (shown shortly after they core is destroyed) shows 4 such 'pathways' into the center of the ship.

I dunno, the fact that they can fly a ship into the thing just makes it seem more vunerable than the small exhaust port on the first one. and i dont think the construction necessarily accounts for the ship size (and not just small ships either) tunnels in the Death Star II.

either way, I think that Obi-wonton's idea could be done...i would be very interested to see a 1 epic movie version along the lines of what i said in my first post and maybe if i Obi-wonton's edit doesnt do that i may give it a shot at some point when i have more free time to play around with it. Kind of as a 'condenced saga' version of the OT

-Darth Simon