Not mine, but worth mentioning.
16 modules for $4400
Will do 8 15mile gems or 4 30mile gems.
I have plenty of harnesses to connect these to bms.
Can also supply link to <$200 bms solution. I may have a few, for those not wanting to wait for China delivery.
I have used Volt modules myself. They make a pretty nice gem high voltage battery. Easily tapped for 88v.