Maybe you should consider starting a board shop that sells other brands and does repairs. After becoming established, maybe sponsor some local boarders. After that, you could consider building boards. I think it would be extremely foolhardy to just start building snowboards. People who start new car companies typically worked on cars and built them for the major companies for years, or even decades, before starting their own venture. And even then, if they didn't bring something new to the table, they went under
this sounds like the best idea.
I think you would have to just start a full on shop though clothing ETC