the axel path isn't perfectly strait but it is much straiter than other designs. i also added two shocks cuz i didn't think one would be able to handle the pressure considering the amount of leverage the swing arms have on the shocks. thanks for the interest.

 if the axle path is straight, then u could shorten the chainstay a bit. I wonder also about the pedal kick-back. 2 shocks plus making this double swingarm a stiff one means a weighty frame. I think so.