You have 3 not so plentiful kits by Harter. Who made the mag pans that are the bottom of these kits. The count clipper was in name only a combat model.Too heavy and was a lead sled.
The Royal Rodent was for Rat Racing in the early days .
But the best of the lot is the Regal Rader a B proto speed model that I think everybody that was interested in going fast in the 50's had one.
As to value. I can't help but given that you don't see them often you should have no problem moving them.

Dennis

any of them should fetch 100.00 on ebay

I suspect that the $199 bid on a 1/2A Ringmaster came from a shill of the owner.  No way for a poor $1.99 kit.