Windshield fit is almost perfect. Of course mine is a '73-80 style, not seen it in a '81-up style to if yours is that, windshield fit is irrlevent. Your choice whether to cut to little grille openingins up there or not. Door to front clip fit is another story. Mostly because of logistics. The lower back 1/4's are seperate sections, so you need to mount the clip, mount the lower quarters, get everything to line up, jossle, jossle again, jossle still again, fasten, unfasten to paint (or in my case line-x). They sell whole front clips as well, I almost thing that would be easier than their pre-split clip because just lay it on there, get it fastened down and then cut it. The pre-split one (which I have), there's too much room for crap to move while your trying to fasten other crap down. In the end, my clip to door lines are a little wide, but nothing I can't live with. You have to cut all the light openings, and get the grille to fit right (I made custom alum. brackets to fit my '73 grille in there), and make a disconnect for the wiring so you can remove the clip in whole when you want (the hinges allow for easy removal, just lift to 91degrees and slide to one side and it's off).
All said and done, the work of fitting it and making it work is well worth it I think. It's clean, it fits well (after a little elbow grease), makes working on the motor for little crap a breeze, and installing and removing motors very easy. Just keep in mind, it's not a 1-2 job. It's a good week or 2. But you won't worry about rust ever again.
There's probably more pics your might want to peruse on my site.
http://www.snyderworld.org/gallery/K5Blazer