Here is a partical secmatic of what I got so far There is a ground through some componet connection missing I think. It does not have the IC under the blob of plastic.
The top part is the basic receiver and the bottom is the power inverter/stablizer.
The IC is a 5 function with the 5 ths or known as boost uses for 2 speed cars and maybe the action on the Wild Char-G.
Not sure on what to start but may want to work on the hardest part first.
PS: Good luck!