Thats a dt-15 variation from TE Connectivity. Ill be getting that from Mouser. The relays are Panasonic 70amp PCB mount automotive relays. Im gonna be using potting compound to fill it all in, and that's also going to be a nylon/carbon 3D print.
My cousin runs the 3D printers and i do all the design and testing. I think he has an Ender something or other for small quick prints and some big one that does up to 3' x 3' x 3' prints.
I'll have to post up some pics. Ive got a horn button adapter and a firewall plate made so my wires are all in a nice round hdp connector.
3D printers really open up what you can do. I've designed road race uprights on them and did a really cool transmission adapter to mate a Coyote to a Subaru transaxle.