Here are some pictures of the connectors for the ESB version. I molded real connectors, machined them out to be molding friendly.
LOL. <speaking like a tour guide> And in the far rear you can see a casting of the Minority Report shotgun. And in the middle a casting of the Minority Report Spider.
The side "rings" will probably have to be closed instead of pass thru as shown. I doubt that the rubber will flow through that small of an opening easily.
The connectors are molded from the Molex connectors. I molded the originals, cast them in pour-a-cast and then machined them out to give back some of the detail. The grey is due to trying to add some black pigment to the pour-a-cast. It didn't come out black as you can see.