Well, kinda. The rear LOWER batteries are mounted and bolted in place. The upper battery has been test-fit and seems to fit nicely.

The lower battery boxes have been sealed and painted. I applied some sound deadening material to the broad panels to keep them from vibrating. The before and after "knock" test of the sound is quite profound. I think it will work nicely.

Once that was done, the lower batteries were lowered in place (with hoses attached) and bolted in. Very tidy! (pictured here without the clamping braces)

I started routing the coolant lines for the lower batteries. Will need to buy/make some couplers to join the two upper hoses to the tee piece. The lower hoses are already connected (the ones with the hose clamps).

Below is a test fit of the upper battery and its securing structure. It's not bolted down in this photo, but is shows what the final configuration will be. The coolant ports are at the top in this configuration. Long hoses will loop around to meet the tee pieces that will attach to the hoses coming in through the grommets just behind the battery.

The BMS wiring is dead easy! I just have to hack up the original low voltage harness and extend it to reach the main BMS ECU (see previous update) which will be inside the front battery box. I've already stripped most of the tape and loom from the harness where required. The hardest part will be running the extended harness wiring up under the hood.