[Graham]

I have changed my mind overnight, and as it it is a type of Rally, we will run it as accumulated times of the series .
Probably more likely to get outright winners this way than if we attribute points.

Graham

Just a thought...an accumulated time based result will work if all the vehicles run on the same track at each venue. But isn't it the case that other hosts will be adapting features on their track to suit the differing abilities of Ninco, SCX and the sprint cars. Therefore times between classes won't be comparable?

It is still the case that each Category will have its own winner, and that the listing in order of times overall is for convenience and perhaps for personal satisfaction. There will be no overall winner as such across categories.

As to the adaptation of the Stage tracks for different categories, I will leave it to the discretion of the hosts to decide. 
My own opinion is that for convenience it is probably sufficient to run each Stage as variations of track layout and dispense with adding the additional obstacles which were a feature previously. I have tried all the Dakar (R5) cars on a SCX steep inclined flyover at Wye Valley on one of their other stages and all the vehicles made it over OK.

So in practise all the vehicles are "Ninco & SCX road worthy" 

I think running the SCX or Ninco obstacles takes alot longer to do, and on reflection is probably an unnecessary complication, so I am opting out of using them this time.