Since saddle pack lipo's look doomed for this year I've been thinking of a contingency plan
Only just trying this out the cars yet to have had a run and everything is just roughly set together.

The basic idea is to have to Trakpower 3600 30C pack fit underneath the slipper clutch adjustment. By default it fits underneath but the heatshrinking fouls the slipper clutch.
I'm attempting to raise the slipper clutch and pulleys up a tiny bit to give enough clearance to hold the lipo in place. As a temp measure I've put two old diff balls in there to raise it up although I need something a bit smaller as the belts run a bit high at the front and might rub when the cars actually running. Also a ball would put a lot of pressure on the bearing so I need to ideally make a small bit of plastic/metal/magic to just raise that part of the groove up.

I've also yet to put any shims/spacers in underneath the screw of the plastic bit that screws onto the top.
I'm off to my LHS to look for something smaller to wedge it up with and hopefully will get running it tonight to see how it works. The alternative is to try shimming up the central transmission a tiny bit to give clearance.