The one with the guy sitting on it looks more like I had in mind.
I think it is a home made special. Probably based on one of the early enduro models. I think it is a Suzuki front end.
Here's another of Pete's bikes. I think he road races it in Vic.
If you need inspiration how about this one.
Here's another off Jared site.
Said to be a 63M frame and 73M motor. Don't you love the air filter mods
. Where theres a will there's a way
.
For some reason the Monty MX'ers seem to convert to road racers/road bikes well, in both performance handing and appearance. You might have to make your own