Make your own exhaust

Customizing my Stryker will be a drawn out event, but I am making plans andhoping to get things rolling. One of the big things I want is a change in exhaust. I have found kits for making your own, and I love the idea. Nothing says custom, like making it yourself. I want to know if anybody has any input. I will have to find a welder (should be easy), but besides that, is this a dificult thing to do. I have the design in mind. Am I biting off more than I can chew?