Looking at those photo's, I would at the least fish plate that welded area with some plug welds for good measure.
The real advantage to a frame chop & drop is no changes to the suspension. You have the lift you need and the suspension remains unchanged. The wheels are moved forward for better approach angles and you have more room for larger tires.
When you do a suspension lift you limit down travel. Even with a diff drop and longer struts, down travel is limited, because the CV joints can only take so much angle. This would keep you struts running in the center with up and down travel.
Of course as Beagle..t has mentioned there is still a raised body mount, lengthening the steering rod, brake lines, etc.
It always looks easy, and sounds pretty easy, but doing & finishing takes more time and effort to accomplish.
Here is Mike Hagan's project
http://www2.zukiworld.com/feature_project-zr3-the-way-a-tracker-should-have-been-built/, it looks pretty simple also.