Rocket USB is basically a USB hub with hard-wired USB memory.

To make it chainable, downstream port should be placed at opposit side of upstream port and it needs to be short. I created PCB to achieve that.

I built one but it didn't work. My PC recognized it as USB hub but didn't recognize neither of downstream ports. Another PC didn't recognize the device at all.

Here is photo of used components. I transplanted parts from cheap USB hub to my PCB.