i suggest either ...
A. get the regular 415 lower chassis plate with slots for your batts. you can install your saddlepacks directly or convert them to side by side - just replace the jumper wire with a battery bar.
B. modify your stick pack chassis ...
- 1. get yokomo BD plastic battery trays
- 2. dremel/cut away the protruding plastic under the trays so you can install them flat on the chassis -but check first before cutting away - depending on your cells, you may need to leave the protruding plastic parts behind, just check if your cells are secure enough when the trays are on the chassis.
- 3. CA/epoxy the trays to the chassis
- 4. put a couple of slots on the ends of the battery trays, one on each end. this will serve as your battery tape slot. or you can get a graphite battery strap and aluminum mounts that will fit 6 cells (similiar to what the 415, xray, yoke, etc has) drill a couple of mounting holes on each end of the trays to mount the aluminum standoffs.
IMHO, this is much easier than converting your saddle packs into stick packs