Thanks Venom - Shrike's question was a good one, and it had me stumped.
And Shrike, your rebuttal is valid, but not relevant. The concept of the GTEx* series is to expand the capabilities of the Arcadia-class installations. That is certainly not limited to currently existing ones; it simply enables the Arcadia "production lines" to go on producing them without major changes, while enhancing the Arcadia's capabilities in different areas.
So, a portal would become a center of transit, and a convienient location for an Arcadia (or two...

) that also had a GTExP - a docking port enhancement.

This way the standard Arcadia could be used once again, which is the whole point.
Hmmm.. I had a nasty idea. Imagine this: GTVA builds one of these portals to Shivan space. They want protection without having to allocate a whole fleet to sit on the node. What do they do? The portal connects on numerous sides (2-6) to Arcadias. Each Arcadia has 2 GTExDs connected.
EDIT: Whoops - I forgot the whole purpose of this reply - the latest screenshot!

I've thickened the portal quite a bit, and moved the beams from pylons to the hub itself. I've alos lowered them from 8 to 6.
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Creator of the Sandvich Bar, the CapShip Turret Upgrade, the Complete FS2 Ship List and the System Backgrounds List (all available from the site)[This message has been edited by sandwich (edited 01-03-2002).]