Had a quick look at it last night and worked out where stuff goes. There seems to only be one slot across the bottom for the one strap but I will email him and see what he says.
The zippy Lipo fits "like a glove" but as I thought the strap is too short for this brick esk battery.
All the mount points on the tray line up perfectly with the standard holes on the chassis. Some screws are supplied in the kit but not most of them which is a bit odd either supply all or non at all I would have thought?
The RX8 mounts straight onto the pre drilled tray nicely, shame that the motor to esc sensor wire is so long...