You really need to measure, ride and look at the hulls that handle best and take things from all. Measurements are deceiving, where the rocker is, where it is shortened and how much of each are key as well as bondline, skag and intake design.
The reason most people walk away is because truely trial and error or doing then redoing is the ONLY way to get the right design. Someone like Tem who understands hydro technology have an advantage here and will make less errors the first and second time in design, if you have the composite knowledge and know what areas need strength and how to add that strength without weight or compermising design and funtion then your that much further ahead as well.
Make an SJ shorter and it will flip but ride like AZZ IMO, but shorten it and ad some performance enhamcers, hook up enhancers and where to add rocker and so forth then you may have something.
Anyone can take a 650SX and hack it up and make it look a little different and ride lighter but to make it worth having it takes GEN1, GEN2 and GEN3 and prolly a GEN4 if your not an engineer in composites, hydro design and know what looks good as well.
Just an example, Superfreak has made their fair share of changes as has Rickter and others.
That being said, hacking your own up and playing with it is a great idea if your tenacious enough to re-do it over and over.