He has one but hasn't gotten around to playing with it yet. I have installed a C ONE underpanel on my yaris. It took some modifications get it to fit. It is really a simplistic design and can be copied so don't be surprised if you see one in the future from garm. The only issue I have had with mine is backing out of my driveway the fins for ventilation scrape and can become bent. Just a heads up garm you might want to alter the fins a little bit. Also the C One I have has an oil drain hole which is worthless to me since Japanese yari and US yari are a bit different.
Funny you should ask. John and I completed the prototype last week and it is in production!
The main difference (besides that ours will fit perfectly), is the addition of 14 turn fasteners for the underpanel. With this method, it will come off in seconds to change the oil, check underneath the motor, etc. Thanks to John for the super clever idea!
I don't have pricing yet, but I will this week. The panels will be hard anodized grey or red and come with all hardware needed to install.