There is an unwritten rule in the OSHW industry, that comes from way back in the magazine projects days (which was mostly OSHW, without the new label).
And that is, you do not compete against the original designer, with your only differentiator being price and undercutting them.
You have to offer something different. An improvement on the design, a different housing or form factor, a niche change, or something...
You do not just clone and undercut as your main differentiator, even though you have the legal right to do so.
Poor form I think.
Dave.