Another quick update...
I finished the bottom tray. Here's a look at the mostly complete battery put together!
I added the USA to the Ford logo, missing from nearly all repros that I've seen.
I made the tray thicker to support the optima height. This actually works out in two ways, first it makes the optima the correct height to the top lid, and also adds a lot of strength to the tray at the bottom.
I'm going to cut up the top cover and the bottom tray so they also come together at the sides continuing that seam line just like you see on the sidewall, which is on the original. This is an unnecessary step, as I could print the entire top lid and bottom tray in one go, but this will add a little more authenticity.
I'm still battling this darn Star texture, it's been such a pain in my side the last few days. There's been some progress here and there, but nothing that I've liked much so far. I wish some of these 3D programs made it easier to extrude in certain ways (often it's just vertical or horizontal).