There is no need to resolder any motor wires. Anything is plug and play. There is a special crossover brick needed to run the second channel (you can see that there is an empty connector between the two motors in my video). I´ve not tried the servo ports yet, but I will when the prototype is finished.
Yes receiver and ESC´s inside, battery external.
It is possible to power Buggy Motors as well, every single channel can output 5A peak and 3A continues. With 11,1V (12,6V when 3S is fully charged) The Buggy motors will run way faster and are powerful enough to overpower your gripstrengh on an axle (i guess that they are stronger as well then). It will be possible to build some very quick vehicles with that.
RC Receiver and transmitter are special for scale construction vehicles. The receiver is running the FlySky AFHDS3 standard and compatible with every remote that uses that standard.
I plan on making smaller versions with fewer channels as well (4,8,10,12,16) but only if my first tests and the prototype are working.
I hope I will finish my prototype in the next few days, then i will upload a video of the testing :)