This kind of nonsense is just not on and needs to be nipped in the bud as it will ultimately stop anyone developing stuff for the good of us all. I had a similar situation early on and it caused me a lot of anguish at the time so I know what you are feeling right now.
If this 'other' member is the guy I mentioned to you then I'm seriously pissed

as the details were given to him on the strict understanding that he could make a one off for his personal use and the information passed to him was not to be used for financial gain as I had given sole design rights to 'he who shall not be named'.
To avoid the wrath of LEC I must point out that at that time 'he who shall not be named' was rather revered on here, hence my giving him authority to manufacture the parts to ensure future availability.
In fact I think around 10 of the evolved design were actually sold. Maybe he is now the mysterious seller?
I suppose I now need to trawl through my old e-mails to see if I can find the evidence to support all of this, meanwhile if someone can PM me (in strict confidence) who this new seller is, it will be appreciated so I don't go shooting from the hip without just cause
I would urge anyone to support Brit Car Nut on this as he is the only person who now has authority to use my design since he who shall not be named went AWOL.