What to do if you want to use it?

If you have an industrial or commercial application, and you think either BB1 or a simple modified version can do it, you have several options.

The first option is to make use of the GPL. You can request the schematic and board layout source file (in EAGLE) and download all GPLed software related to BB1. In other words, you don't have to spend a cent to acquire the design for your application. Of course, you are still prohibited by the GPL to distribute BB1 and all other GPLed designs as your own. Even if you modify/improve the board, you still need to retain my copyright notice and make your modified version available via the GPL. For as long as you respect the GPL, you can still sell manufactured PCBs to others. It is just that someone else can request the schematic and board layout from you and start selling the same PCBs.

The second option is to collaborate with the inventor and get some extra help for consulting fees. As far as licencing goes, everything is still GPLed. However, the inventor may be able to help you improve BB1 and/or its software for your application. This can save you time (especially time-to-market) if you do not have an embedded engineering team at your company. Afterall the inventor should know the product better than others.

The last option is to contact the inventor or another embedded engineer consultant for a custom design that is licensed to you and you only (or any other special licensing agreed by the inventor). This way, your design remains as yours and no one else can take it and start to manufacture and sell your PCB. Of course, this option tends to take up more consulting hours because the embedded engineer (including the inventor) needs to redesign from scratch.

As far as the logistics of PCB manufacturing goes, you can consult PCB houses that do the whole nine yard. Please note that the board layout of the current BB1 may not be friendly to automated pick-and-place.