Read the F16 class rules my dear friend :

Quote

1.1.2 For construction, all materials and methods are allowed when these do not imply either an unacceptable risk of bodily harm or the operation of an unseaworthy craft.


It is actually the second rule from the top you would have seen it immediately.

Wouter

Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands