With my current pipe dream being to get physically involved in aviation instead of only theoretically, I looked into the regulations for ultralight planes in Germany.
On multiple occasions in the LTF-UL regulation it is mentioned that in special cases the design inspection authority "Musterprüfstelle" needs to approve the aircraft.
This and the fact that most articles about building your own UL are referring to using existing design patterns "Muster" makes me wonder if it is even possible/feasible to design your own UL aircraft.
So the question is split into two parts:
Is it possible to legally design, build and fly your UL in Germany (complying with LTF-UL)?
Is it feasible to design, build and fly your UL in regards to the financial and time-killing aspect of the bureaucracy in contrast to using an existing design pattern?