Have you thought about doing a front K-member? Just cut the frame in front of the cab and weld it in. Theres lots of companies that can make awesome front suspensions. Whats nice about that is itll save you lots of weight and they come needing only slight adjustment to get the geometry right, much easier than starting from scratch. But on the down side they are pretty expensive, especially if they have to custom make mounts for the IDI... Just a thought