Update! battery box preparation
Sup homies!
I finished preparing my Peli 1200 case and now it’s ready for the 12S6P battery to be fitted 
The first thing I did was change the mounting hardware that attaches my battery box to my deck, I am now using M8 countersunk barrel nuts on the deck side and low profile M8 bolts on the inside of the case. This gives more room for the battery, the M8 Nyloc nuts I had in the bottom of case before took up 5.5mm of dept, whereas the heads of the low profile M8 bolts only take up 2.8mm.
Next, I designed and 3D printed a loop key and corresponding socket that’s mounted on the lid of the case, so I can disconnect power form the system when required. I 3D printed these parts out of ASA, as this is supposed be more weather resistant compared to ABS and bonded the socket to the case using Araldite.
To rout the power cables out of the Peli case to the ESC, I 3D printed a custom cable Grommet out of TPU and glued it to the case using Araldite. I’m happy with the how the 3D print turned out but not with the performance of the Araldite (it fails when things flex), if the bond fails I might switch to a mechanical nut a bolt mounting method or find a permanently flexible adhesive.
I placed closed cell foam in the bottom and lid of the Peli case to hold my battery it in place and cushion it a bit. I also had to chisel away some of the Peli case internal features to get my battery to fit properly. I might add thin vertical strips of foam around the sides of the battery to lock it place and protect it further.
I haven’t been able to build my battery yet; I have borrowed a spot welder, bought my cells and designed and 3D printed a custom cell and BMS holder, but the battery building supplies (nickel strip, 21700 insulator rings and fish paper) haven’t arrived yet. This is kind of annoying as I ordered them from a UK seller on the 29th May thinking they would provide good quality components and fast delivery. I got tired of waiting yesterday, so I ordered from an alternative supplier so hopefully I will be able to crack on with the battery build soon 
I’ve been testing the assembly of my prototype gear drives, more updates to come shortly about installing them on my board 