By the way what I show you here are not exact instructions, they are more like ideas you could use in your ball machine. But i don't mind if you copy them.
ps im sorry for my bad english, im from holland
here is a link to trainmans instructable, it might be handy to use them both:
and a link to POWER TOWER, my latest ball machine
Step 1: Normal pathing
this is the most used path, its not very special but it will do.
Step 2: Triangle path
if its not clear enough please ask a question
the big avantage about this path is that it is very strong and durable, u could make a long piece of it without support.
Step 3: Path DUH
Step 4: Crosties path
turns might be possible but i think it 'll cost a lot of pieces.
Step 5: King's path
Step 6: Skinny path
that thing on the side of the path ( i dont know how to call that in english) ensures that the ball doesn't fly off, u could make it on both sides