I'm done with the last version.
It does not infringe the patent, and should resist, it's thicker than any of the other.
Pretty sure two persons (two like me at least^^) can step on it without breaking it.
Problem, now it cost way more to make... but still under 300$ !
Try this link, you should be able to see it:
Porsche Boxster Intake Plenum (F3SH5ZNFE) by Ben006
I'll continue to update it until I now what I'm allowed to do or not.