Thanks to Marty on the forum here, I got hold of a BMW X5 24kWh pack
Still trying to hunt down shorter length Tesla Model 3 module for the other pack, but in the mean time I wanted a handy smaller pack that was easily controlled and a working BMS option for testing and getting things proven. The BMW packs suit with work by Damien and others on the SBox reverse engineering and then Tom's SimpBMS to keep an eye on things. This will be used to test the Mitsubishi heater and A/C compressor, and have some Leaf stacks to test with a second Zombie vcu. It may make its way into this project for initial drive tests. I believe the SBox is fully integrated into the Zombie including shunt duties, which would be tidy. Although the SBox component ratings don't look like they'll suit something this heavy without limiting some parameters!
Not far off fitting under the car as it is, but wasn't the intention
The benefit of the BMW packs, only a couple of hours got lids and casing removed, Tom's SimpBMS and a Nextion display screen connected up, and an Arduino Due running Damien's SBox control sketch. Shout out to Greg for his excellent videos on connecting to the BMW packs too!
Actual connector DC voltage matches up with both the SimpBMS report and the SBox controller output
First time using SimpBMS so didn't dive into the settings but obviously need to adjust the cell numbers expected. Thanks to Andy and Tom for the tweak needed to allow Simp work with the 12 module X5 pack
repairing the rear arches and sill.