Don't get too wrapped up in the calculator. It's great and all to get a general gist of "where" you need to put "what", but in the end it all comes down to what you can make fit where. The biggest piece of advice I can give from when I 4 linked my rig, is to make at a minimum, the upper link frame mounts adjustable, and if you can get away with it, the lower link frame ends as well. That way you can dial it in to suit the terrain you're running in without having to cut anything off...
Bah - it's dirt simple man. Don't too wrapped up in the terms. 4 linking a TJ without some frame mods will result in a far cry from the "perfect" setup, but will still get you by, although some of the lesser qualities can be overcome by sway bars, upped pressure / oil levels in air shocks / coilovers, stiffer spring rates, etc...
Oh yeah - I haven't forgot about welding your stuff up if you still need it done. I *should* be able to get it done the first Sunday in May depending on what surprises work has in store for me....