All in all, I've released three 3v3 maps (Asteroid Belt, Gateway to Paradise, and Ring of Risk) and one 5v5 map, Red Crush. However, as of this time you can't load them onto Sins 1.16 or Entrenchment. Making them playable for 1.16 or Entrenchment might be as simple as chaning the version number to 3 in the map text files.
Here's a link to a single file containing the four maps (with Asteroid Belt shown for the screenshot):
Here's a link to Red Crush, with the screenshot showing the map:
Direct link to a zoomed up Red Crush screenshot:
As you can see, Red Crush is a "fight for the middle" type of map and not a "stab them in the back" map. It doesn't have any neutral extractor spots, but as I look at the screenshot, I can already contemplate the types of early-game strategic issues it might raise.