Ever looked at a Toyota Hilux? If you haven't try google images or maybe take a peek under a Tacoma, it should be similar - it's all about the choice of shock and where it attaches to the LCA - and rather than cut off the strut mount, use that to mount the top of the coil over, which has already been done by Kreator in his kit, and I don't recall him cutting the spring seat off of the frame.
I'm not impressed with Calmini's execution, especially with regard to the amount of rework that everyone seems to need to do with this "bolt on" kit, but I will give them kudos for thinking outside of the box.