chazz
in my opinion for what its worth, if you have it online somone somewhere will make it public or share it
i would produce a basic build manual, (black and white paper) then offer the colour version set up etc as a download for free. ( after all the owner has bought your product and is now a family member, is it fair for them to pay out for the info to run it?
i have built many kits and never had a "online cd/manual" i find the ones that come with pc software etc a royal pain in the arse to read, go back to another step etc.
i believe xray have the best manuals and downloads have a look here
http://www.teamxray.com/teamxray/new...d942c48172b6b7
just my thoughts