Optional bits:
Optional alloy 1 degree rear hubs are well made and look good, plus offer vertical roll centre adjustment with washers
Nice alloy servo mounts - no need for them, just look good and match the other bits.
Alloy clamp on wheel hexes
Alloy idler gear
Uprated (thicker) turnbuckles. Also have holes pre-drilled in the rod ends to allow access to the hex ball studs so you don't have to unclip the turnbuckle when changing roll centre holes
Alloy front bulkhead with brass insert
Rear alloy bulkhead
Front alloy brace (grey) and kit (blue) - optional part not needed!
Kit versus optional lightweight motor mount