So basically "I made dis"?
I think it would be better the wider the scope.
Because there'd be a lot of people who might not really understand what they're looking at (or hearing if it makes sounds) you'd want to require titles like "I made dis sofacondom" and a brief explanation of what it is, how you made it, and why you are proud of it. You're right, links to communities with similar stuff would be great, but if they don't exist yet it would be a good place to get them started. For that reason, keeping the rules loose about what counts as "made" and the categories of projects seems like it would be good.