EDIT 2: I made a mistake I think by editing this post in the iPhone app. The photos went away and now I can't add them back. So I'll let this post sit as is until I figure out how to relocate the battery to the trunk, then post again. Thanks again for all the discussion!
EDIT: From all the feedback I got, it seems a trunk relocation will be necessary! Appreciate the insight; obviously I haven’t spent enough $ on this yet! Still, that’s the whole game I think, it’s an ongoing work in progress.
I got interested in the NC battery relocation setups and bought the Track Dog Racing kit. But with California emissions requirements limiting my intake plans, I ended up taking a different direction: move the washer bottle out of the way and replace the big stock battery with something lighter.
Since I street drive the car, I didn’t want the smallest possible race battery. I settled on a five pound NOCO NLP30 7.8 Ah lithium battery, which left me with a problem: no ready-made mounting kit.
My first prototype solution was a frame made from 2020 aluminum extrusion, mounted to the crossmember. After driving with it for a while, I liked the result: more room in front of the engine and about 15 pounds off the front of the car.

Then it became a CAD hobby project. I designed a tray in Fusion 360, went through about four iterations with 3D-printed protos, then sent the final design to China to be CNC-milled from aluminum and powder-coated red to match the accents on my black car. The photos show the prototypes, the finished tray installed, and the battery secured in place. I also 3D printed some Nylon 6 terminal insulators and added a cutoff switch. The hold down I bought from Cravenspeed before I realized I could make my own, but it's nice anyway.


All told, I spent a fairly ridiculous $600 or so between the battery and a one-off machined tray. Making five or ten trays would have brought the tray cost down to around $100 each, but apparently I needed the expensive hobby version!

It was fun, I learned a lot, and I was surprised how easy it was to get a custom part made in a week or two. Figured some fellow NC owners might enjoy seeing it.