Double wow.
Legal and airworthy are two very different categories.
An airplane, certified or otherwise may be legal but it sure as hell may not be airworthy.
I may not be able quote air regs chapter and verse like ya'll but over the last 40 yrs I have developed a keen sense of airworthy and placards or not any time any airplane with me in it leaves the ground,,,,,,
It is airworthy.
Paperwork doesn't create lift.
Flame on.

Ray