In common with the other prototype I mount the battery-packs on the aft bulkhead, where edge-protectors will include screws for fitting rubber-bands around the pack.
Forego plastic trays featuring on the other prototype, and instead I'll add a length of Velcro tape to the bulkhead to engage the underside of the battery.
Must break off now to fix a toilet, flushed as I am with the success here.
