Leading Edge has a website at the following address (http://www.leadingedgerccars.com/). There is contact information there if you want to email or call Dave Whitesel, who is the owner of Leading Edge.
Leading Edge is located in central Indiana. There are quite a few drivers in Indiana who are running Leading Edge chassis. New Castle, IN - Moose Lodge is one location where you will see a lot of these cars running. Here is the Hobbytalk thread for the New Castle track (http://www.hobbytalk.com/bbs1/showthread.php?t=156778). The Leading Edge Lightning and Executioner chassis have done very well in the BRL (Brushless Racing League) which has its own forum here on Hobbytalk in the Oval Racing area.
The Edge chassis is an upgrade chassis. Because of this there isn't really a manual. I suggest that you download the Associated 10L4o manual as a reference guide in building your car (http://aedownloads.com/downloads/manuals/10l4o_manual.pdf).You will either need a donor car such as an L3 or L4 to make it complete, or you can buy the parts you need at a hobbystore. Another oval oriented online store is rc4less (www.rc4less.com). Another good source for oval parts is Team IRS (http://www.teamirsrc.com/). They make the caster blocks that came on the 10L4o and they also make lowered aluminum motor pod plates. They also make other oval upgrade parts, but you might be able to find all of these parts for less at a hobbystore.