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Add a cylinder that overlaps the Rib (see middle pic, front view).

And that is it. create several Ribs and move them down the tunnel. create several cylinders and move them up (extending then to...

Extrude this new shape and move it back into the tunnel extrusion - this is what I call the Rib.

Put the smaller one inside the larger one (first to lines of pic on the right). Then click Functions->Connect

Which creates a single object (third line on right).

Enlarge the other copy of the octagon.

Make 2 copies of the octagon and shrink 1.

Merge .ai file into C4D and extrude (no caps).

Create in Xara.

I created the splines for the door in Xara X.

I then took the main squashed (outer door frame) octagon and extruded it to make the tunnel.

I then took the main squashed octagon and streched...

I'm with Gidgit - fire away with any additions you can.

Still fighting with the lighting. Here is the new progress.

Turan

Had to give it a go in C4D. Not as cool as yours but still a work in progress.

The odd blue bits are were I was trying to get a blue mist drifting from the open door.

Drawing something that is...

All good fun. Sorry by the way in all that I said, I did not mention how good the drawing looked.

I'm with Mike for you to give us a break down.

As for a sample of my work, see attached. Mostly...

Hey gidgit - is this the same Gidgit that made me feel bad about using CD4v6CE? http://www.talkgraphics.com/images/smilies/smile.gif

As in "We need more C4D experts around here... did I just say...