I dare say most inventor-types don’t have anywhere near the background that trained Industrial Design have. Ideas are, literally, a nickel a dozen (half of what they used to be), and design and manufacturing are far less than half of the overall picture of “producing” a product. Few individuals possess all of the traits required to successfully bring an idea to market, let alone succeed after it launches. It isn’t for the faint of heart.
That said, you won’t find too much on the subject in the Design Employment forum… try the “Projects Forum”.
Here’s a good one > Refining My Product
And… X-JetPack
And … Bicycle Design to Kickstarter
And … you get the idea. 
Let’s see how your question flies over there…