I was looking around and could only find two maps that people had made to try to replicate Tribes gameplay. I was pretty disappointed with that, so, I decided to make an attempt at doing one myself. This is a a map based off "SuperCross_2" from Starsiege Tribes. Two bases connected by a long bridge that has a small pillar between the two sides. This is a great map from small CTF game play. I will be honest, I got lazy when it came to placing the links on the top of the bridge. All that's wrong is that they don't line up completely straight. It plays just the same as if it did, it's just not aesthetically perfect. I highly suggest you use the gametype "Tribes CTF" by Haoshiro to play this map. Else wise, it probably won't work well. The last picture shows how I made Inventory Stations possible. I've got to give credit for the idea to Haoshiro. Borrowed it from his Broadside map. (P.S. There's another Inventory Station on the parallel wall with more weapons. They're on the level directly below the flag)
It seems like it would be quite unbalanced if each team had 4 power weapons, with just a long bridge in between? The sniper would dominate. Just my opinion, I haven't played the map but from the pictures that is what comes to mind.
That's what I was fearing would happen. Everyone starts out with Jetpacks though, so, It's more difficult to use the Sniper than it normally would. Also, if someone is walking down the bridge you can't see to the other side due to the pillar.