Made good progress on modeling the parts so I can design the case that holds everything together.

I also designed and printed the parallel battery box (pictured above middle).

I have to make a model of the Pi 4B still and then do the designing... aiming to get the entire body done by end of this week if no printing/measuring mistakes.

I also cut the first holes into the hat for the bolt mounts.

And... I already made a mistake, the part I printed is the wrong thing. I used the black battery cell holder plastic things instead of the wrapper design that goes around it... so I gotta redesign that and print it again... great. Was only a 2 hour print though.