lynx We don't use Intel Boot Guard (or similar) yet. We will offer it in the near future, but it will be optional (yet recommended for users who don't play with firmware) to fuse the chipset so that it only works with NovaCustom signed firmware.
We highly appreciate freedom, which is why we won't limit the use of only our own firmware version.
While it is correct that we cannot give any warranty on firmware that hasn't been provided by us, feel free to build the firmware yourself.