help with tomahawk!

i am half done with my tomahawk, and this is exactly like the one they made in VEXLABS
only problem is that I dont know how to make an axis for the motor to spin that is 1-3 cms long for the motor modules and the servo
would it matter if i put one for two motors by connecting two opposite motor and servo modules with one 2 or 3 inch axis in the middle?
would that work?
i need to know ASAP

if anyone could help i’d really really appreciate it!

also i was wondering if anyone has any chains that they are not using, cause I will need another 96 inches, or more!
i can pay for it, just not 15$ for 48 inches