You all have been patient, so here's an update. The biggest milestone is that the electronics design is finalized, barring any unforeseen conditions from testing. The first electronics boards are being manufactured and tested now.
The prototype housing and lenses have been test-fitted and some minor adjustments have been made. We want the lights to be totally plug-and-play, so it was good to confirm that the stock Z bulb connectors fit snugly.
Also the design for the diffusion plastic has been test fit and looks good. One of the most frequent questions we receive is how much will the taillights cost. Unfortunately, it is too early to say. We are in active talks with an injection molder and that is the biggest unknown at this point. Once the injection molding is nailed down, we can likely provide an accurate estimate, so expect that update as soon as we finalize negotiations.