Before i start on this project i just want to make sure it will work. Right now i got a 121" sc-4 suspension and 1,75 track. 8 tooth drivers. tunnel coolers refitted under steps. I got almost all parts to build up one vmax more. This time a mountain model 142-146"? im not sure yet how long. but i really want to put 2" track under this time. I have read something about lower secondary axel as near to tunnel as possible and tilt chainhouse back in bottom. is this enough? I don't want to start extending chainhouse.