There are several factors that immediately come to mind.

What is your area? How far from home will you work?

What kind of people? Individuals? Business? Stores?

Why would they want to buy your product?

How would they want to pay for it?

How do you intend to deliver?

How long between order and delivery?

What kinds of 'custom' things will you include?

The idea is very interesting, and could have reasonable chances of success, but marketing does entail more than just the ideas. Once you answer the kinds of questions I ask, you should spark some ideas about exposing your product. One thing, DON't be afraid to make some samples and go talk to people!

Check out my website, look at the 'Free Stuff' link. There are several hundred douments/references there that may be of assistance.

Good Luck!

Source: http://www.abusinessmentor.com