[mrlmd1]

Before you plan to fabricate a particular item, you could post the idea and projected cost on here, get feedback on ideas to improve the basic design, and get some idea on what the demand is, ie, how many would be sold. They could be pre-ordered before production even started, no need to make many more than needed, don't have to keep a larger than necessary inventory, or manufacture something that has no demand.
If the item was successful, it could then be marketed to other GZers outside the forum, through dealers, aftermarket accessory houses, etc.