Yes, it is rude. I know from where you come on this deal, but if you are going to undercut the guy, it is "better" (somehow) to do it on your own (IMHO). I build a lot of my own stuff, and I also manufacture stuff for sale. I sometimes steal ideas from other people's stuff, and I get people in other cities that want to buy one of my creations "to try it". I know they are copying it, but I have no patent, so.... I suck up. Copying someone else's product is thievery, plain and simple, as they probably have lots of expensive R&D in it.(Repeat: I steal ideas now and then, too.) I'd suggest you make it "legal" and find another boat with one already on it and copy that one. That shouldn't wee off your sales guy. (Ribcraft, in Marblehead? Say Hi to Adam, et al, if those are the folks w/ whom you are working.)
Life is a grizzly experience.