BIG CREDIT goes out to these guys for there thoughts & engineering!!!!
The down falls I see here are:
1) Heat off the motor.
2) You hit something up front and you could ruin more then the kart (motor pkg.) let alone having the motor in your lap.
3) Steering. Unless they have the weight distribution right, better have strong arms.
4) Arrow. Going to catch some major drag. May not be bad on a sprint track??
Here in KART land, we have made some REAR engine “laydown” animal karts in the road race division that have done real well. The main object was to give the driver more compartment space especially those that are wide up in the shoulder area since the animal motor is much wider then most motors we currently race.