Can anybody be a speaker designer?

“Only one way to find out.  Try it and see.” ... only problem is “they” probably don’t even know which end of a screwdriver to use, let alone how to build anything except for crappy threads.

Could be. Only one way to know. Put up or shut up. Let the cards fall where they will. Maybe Kenjit has some buried talent that is clearly not apparent via Internet threads.  He clearly is obsessed with speakers.   Nobody knows for sure what they are capable of until they try. Talk is easy. Anyone can do it.

The truth about hitting yourself on the head with a hammer is that it only feels good when you stop.

Same with reading posts by Kenjit.

The speaker industry is what's known as a meritocracy, good designs sell bad ones don't for the most part. Beyond that nothing is really needed.

Can you please stop posting crap on Audiogon.  You continue to post speaker crap all the time wasting everyone's time.  It is so old now.  If you think manufacturing any audio product can get you rich then give it a try.  In your case, go ahead make a speaker and try to sell one and see how you do.  Please go ahead and then place an ad here on Audiogon for us all to see.  Then lets see if anyone buys one from you.  I can't wait!