I do not *personally* know about the US industry in fact but have plenty of practice in similar fields in several countries.
And my family has a law practice, fwiw.
And lots of experience and anecdotes from US clients and similar cases.
Designing and manufacturing the fixture has low-zero risk if You and Your business have zero relationship to the product made.
After that, it depends.
How well can You insulate Your capital goods and other business from being attached and put a lien on, in case You are sued by someone, for something ?
A funded competitor could simply sue You for (theft IP, copy of) ideas, patents, or poaching with zero reality in fact but still keep You in court for years, and usually attach your assets if they can post bonds for same.
Not saying it will happen. Saying it is common with big us corps, brands, trademarks.
Have received the 1000 page legal doc on behalf of a client.
I suggest that the costs and legal and unknown unknowns are probably 10-20x the price of the fixture.
You can get business continuity insurance from loyds, alliance, whatever, but what happens when they don´t pay and You need a second plant tomorrow to keep producing ?
While Your doors are sealed by court order/bailiffs etc ?
I did not say not to do it.
I suggest probably upsizing pricing by about 10x and producing it in a way that avoids likelyhood of your plant being closed by bailiffs.
You can always agree to credit the customer by 80% after x months if they assume all liability.