Steve,
The home made diff plate was knocked up by josh1a1h (think thats right) and you mount the centre diff sideways on the chassis plate. I experimented with having the diff on the bottom but a worry was that a knock on the bottom would upset the mesh. You lose the 2 speed box altogether.
The alloy box is a battery tray i had made up by a friend for my brushless lightning stadium, but it wouldnt fit under the shell. I then found out it can fit between the TVPs of the desterboy kit at the back and itll the battery less movement, but only fits 4S afaik.
The other plate is an Alza racing XL motor and ESC plate.
The drive shaft was made for me to suit the diff by candyman on here and seems to be very beefy. He can do UJs as well.
My original plan was to get a new set of TVPs made up for it the same as the DB17 kit and also get some spacers made to widen the chassis a bit. Then have the centre diff installed as low to the bottom as possible, while still being protected. Then have a castle 1717 sliding down the centre with an MGM ESC above the steering servo which would be placed beside the front centre drive shaft, again as close to the bottom, but protected at the same time. Then have the batteries lower in the chassis at the back. Then have it all covered by an MCD monster truck shell (still have it in the shed if your interested, fits like a dream, but needs extended bumpers front and back) along with some nice wheels and tires. I had thought of baja rims and tires, but thought they may be too heavy in a jump. Think i originally settled on some 40 series big joes or similar.
All this would be floating on IRC shocks and an HPI suspension conversion kit, along with alloy bulkheads and alloy diff cases with hot bodies lightning hardened internal gears and bullet proof main gears.
4S was to propel it to a nice cruising speed of about 45-50mph with correct gearing. And 6S for when i had a bit of money and wanted to spend it fixing my savage
The plan was dropped to allow me to join my dad and mate in a group buying of 3 agama A8 Evo FR buggies with bullitt B218 engines. Was money well spent.
I think if i had the time again, i think i would give it another go, but id be doing it properly this time and not taking shortcuts.
Good luck with it, however you decide to play it.
Thanks
Chris