Update: battery trays with Aluminum stops (front and back) installed. I used a 1/4" thick piece of Al at the front of the right hand tray to mount a brace to the front bulkhead and also to attach the steering servo tray.
Now, I think I'm ready to cut about 2" off the front to give me a 20" wheelbase. Just wanted to see exactly how everything would fit before cutting (I haven't found a good way to glue aluminum back on yet - so don't want to cut too short).
And yes, I need a velcro strap on the right hand tray.