Had some more time to work today. Baby daughter has been sick, so had some time to work while she napped today. Got the tvp template transferred onto the pressboard, then cut it out with my bandsaw. Made quick work of it.
I doubled up two boards and screwed them together with the paper template screwed and taped in. Ended up needing minimal trimming to fit, mostly around the upper bulkhead connection.
Pulled the other tvp off the XL, and just bolted everything onto the new tvps.
So its not massive, but def bigger. Could use a bit of widening tho. 1" per side would be awesome, but parts just not there. I know FLM has a .5" widening kit, but its $$$, only 0.5", and alu.
Hopefully the MBX6T parts come soon and everything works w/o too much of a pita. We'll see.