For starters, you can get all of the instructions necessary to build your own Holoseat from scratch online at dev.holoseat.com. You can also follow the development process at that same site and by following our blog/social media channels.
It also means you are free to modify Holoseat all the way from its firmware to its housing. Of course, we would appreciate it if you shared your modifications with us so we can evaluate them for inclusion in the next release. But, the choice is yours to make. No one is going to force you to share personal modifications.
Thanks to the Open Source Hardware Association for shepherding the OSHW definition and for providing the certification process. We love the updates to the certification website and are proud to be a part of the OSHW community and movement.