I think back at the beginning when the class was dreamt up, the organisers simply assumed the grid would be full of RC30's, 0W01's, RG500's, TZ750's etc.

I don't think they understood the relative rarity of sufficient numbers of these machines, their value, and also the lack of availability, along with the cost, of the parts required to keep them running for a week of practice and a race.

They then appeared to hastily re-write things, to include 'silhouettes' in an attempt to fill out the grid, it certainly needs more clarity for next year.