E-Bay has lots of bicycle cable options that would work perfectly for your throttle cable setup and any other cable controls you might need. You can order long pieces of the outer sheath and the inner stainless wire cables in various dimensions and cut them to length. I'm currently using a bicycle brake cable on my GT6 MK1 2L as a throttle cable, works great with no resistance, as the outer cable sheath has a Teflon lining. Looks like you're getting closer and closer to that first run down the block! Keep it up, good job!👍