I came across some specials based off the Honda S600 and S800 roadsters on Japanese Nostalgic Car.
The more 70s and wedge like of the two is this Carrozzeria Watanabe Griffon based on the S600. Now much to give away its S600 roots.
The other is a Garage Suzuki Special S based on the larger engined and more conventional S800.
Presented without any additional information is this curious Ferrari clone based off the S800.