There are no full "kits" for cafe racers, at least for a 750 that I know of. If you're looking for a kit to put together, but a model airplane. That's a harsh reality but it's true. If getting dirt under your fingernails, losing blood, sweating, and swearing at your tools, parts, or whole bike don't seem like a fun Friday night....then you bought te wrong bike. Like cal said there are thousands of project threads between this site and dotheton forum. There is no "easy" way. I find that lookin at completed projects gets the creative juices flowing. I like to picture a final result in my head and then chip away and making it happen. The search bar will be your best friend. I'm not saying each aftermarket part has to be fabricated custom just to work. Plenty of parts bolt right on, but then again it all depends on what kind of look you want.
If you have metal work experience and/or access to a welder then you've got a great head start! Ask questions but make sure to search them first because they probably have been asked before. Almost all of my questions have been answered. Good luck!
