A little more progress today. The blue boards are the mechanical restraint HMS asked about. They are connected together with all thread to keep the batteries tight together. Nothing is aligned or tightened at this point.
The large 4/0 cables on the right will go to the inverter. The solar CC and the house power will tie into the busbars on the bottom. The whole assembly just fits into the genset compartment, but first the battery cells need to be bottom balanced. Hopeful that will start next week.
*EDIT*
Victron no longer recommends the Battery Protect for any reverse currents from a charging source to the battery. Only a discharging current from the battery to a load. This component has been removed from the system.