>> bill gates worked for ibm and married for 30 years, a couple takes their partnership propos the idea. he said we don't see a market to a whole new level by going for that. don't see that many personal into business together. computers and -- i think they made a mistake. >> we balance each other. >> reporter: kathy does the i can't do what he does. books, takes care of the taxes and comes up with creative prodnduc names. her husbanddoes the hands-on he weren't do what i do. designing. he can't do paper work, and he is not organized in that area together they because he's more creative. assemble the products and the world's shortest assembly line and what >> yeah. is mostly an empty warehouse. running business when you're >> got an income that keeps the sharing the same bed. lights on here and at home. at's good. it's my diy economy series next >> reporter: the phelpsi teamed hour. up with an your doors writer and designed a series ofwaterproof fishing guides. once again, going with their theme of making life easier for people. b >> we've been out fishing, i can never remember how to use the lure. >> reporter: his latest project -- a new type ofharcoal chimney that heats up the coals then drops them without any mess. these are just prototypes for now. he's got a patent pending. so far six stories carry their products, but they theme of