Craig I'm a big fan of retaining the back seat...it can be modded, but I like to have it.
I actually have a 4-bar and used parts from AME to build it, it took a lot of fab time...a kit would have been nice a few year ago!
If you can figure out how to package a 3-link and feel good about the geometry improvements (it should out-perform the 4-bar) I say build it! As you know every car/suspension has compromise...with the LD 3-Link it's back seat fitment. And install instructions and templates are VERY important as many customers are only hobbiests, not that we cant do the work...but a little help goes a long ways!
Good luck with this, very exciting stuff!!