1 the FW chassis has a wider wheels bas and taller tires which makes it more stable and a faster on top end.
2 No problem with the electronics, however you need to cut the mounting ears off of standard sized servos. you may want to concider a cheaper servo or smaller servo if you don't want to modify it....
3 You will have a very hard time flipping either Sc or FW chassis
4 the new pro chassis looks awesome, should be lighter and stiffer
5 Yes you just cannot use the pro steering plate you will have to just use the FW steering plate
6 slotcar motors fit, but stay with the 16D or the big block(chubby, speed 300), but you will need the conversion kit to use it
7 the stock car is faster than any micro other than the big block (chubby, speed 300) powered vehicles.... but you can get the conversion to use any of those motors and be faster agian