The console in my Alumacraft is aluminum and came from here: https://www.akmccallumco.com/
They also have a bunch of related stuff not on the web site, just ask.....
Do you realize that the jack plate also sets the motor back?? Almost un avoidable....
Check Tiny Boat Nation for a "Transom Plate".... https://tbnation.net/products/transom-mounting-bracket
If you order make CERTAIN of your existing transom thickness.....
Ya'll going about this the HARD way. TH Marine makes what they call a "Mini Jacker" that bolts to the transom and is fully adjustable that allows the use of a long shaft on a short transom. I used it to mount a long shaft Merc (20") to the short (16") transom of my 1448 Lowe. Sold the boat and...
Everything in your boat that is electrical should be "home run". That is, an individual ground and an individual positive. I would NOT recommend using the hull as a ground like in a vehicle. Use a QUALITY fuse block (Blue Seas) and it will have both connections.
Don't know where you're located but I have a neighbor here in central NC that has a NEW All-Weld, 1236, never been in the water for sale. I thought about it but want to stick with my MirroCraft for now. His is rated for a 15 if that makes any difference it might be worth the road trip...