I did a 3 link front and semi-triangulated 4 link in my LJ ... its not a JK but it runs JK axles lol. also it is put together with all Curry johnny joints and came out cheaper than those kits look like they are going to run, and it drives great. If you have any 4x4 shops or local fab shops around you maybe have a chat with them and see what they would charge to build something similar.
I will admit, I have never been a fan of metalcloak or seen the benefits of running their products, it just doesn't last in our climates up north.
Dirt Lifestyle on Youtube also has some awesome videos explaining suspensions pros and cons... I know he has a video comparing 4 link to radius arms ( or at least a bit of an explanation mid video) but I cant find it to pos the link.
here are some pics of my suspension. obviously JK suspension would be set up differently but the arms are longer already and the underside is flatter lol. also 4.5" is a pretty tall suspension. what size tires are you planning to run and do you plan on keeping the stock axles?
