Serum,
Here is the center diff used.
http://cgi.ebay.com/ws/eBayISAPI.dll...957238305&rd=1
Here is where I got the custom rear drive shaft.
http://www.rcalloys.com/
The rest was just fabrication. It really was not that hard.
Never tested a Plettenberg so I really can't say. I've got a 2240/10 running 18 cells in another E-maxx. It spikes to 107 amps but pulls 60 to 80 amps normal. So the 18.97 should work fine.
Thank you,
Promod