Why didn't you - whilst you were about it - bring the motor behind the front axle? Or was that a weight thing?
The first chassis I did was a direct copy of the viper . I set it up top hold a Little Ripper - Plafit sized motor. I found there was a shortage of choices in that size so I modified the chassis design to hold the larger ninco motors as well. Actually you could mount the smaller motor in the rear position if you wanted to.
Instead of the magnet, what about leaving a little strategic weight?
As far as the weight issue I tried to make the chassis as light as practical. This way if someone wants to add weight they can place it as they deem necessary And magnet racers can keep the weight low.
I asked if you were going into business... I se that you are. Do it now for the New Viper.
As far as the business goes this is really just a sideline that will hopefully pay for my hobby. Or at the very least I'll end up with a cool chassis under most of my cars. I'm planning on eventually doing the new viper.