Welcome brian, thats an interesting and unique idea, i too am in the process of setting up a business venture see
http://www.automotiveforums.com/vbulletin/t27496.html . I think u might see quite a bit of interest for this as many model makers lose or break parts and sometimes replacements cannot be sourced, especially if the kit is obsolete. I think u may also see interest from scrath builders but i am uncertain as to wether the medium u are using will cause a problem??? Acrlic is not really used in this hobby, anyway i sent u an email about something im interested in.