The binding post shown at the Merlin link you provided appears to be
this one from Cardas, which is described as being patented. Are you sure that the design of yours is sufficiently different to also be patentable, and to not infringe his patent?
Also, from a technical standpoint I see no reason to attribute whatever sonic effects a conventional binding post may have in a given application to having "larger metal in the signal chain," especially given the short length that is involved. I would expect contact integrity to be the most significant variable in typical situations.
I don't generally like to be discouraging, but (as is often the case) I think Elizabeth's comment above is right on.
Regards,
-- Al