[cooperhw]

By "extra strength" I mean about 6 inches of one frame on top of another frame welded and plated as opposed to a traditional Z which starts out with a vertical cut butt welded with only a couple inches of each section touching/welded, before plating begins. not to mention that my frame would remain perfectly straight, level, etc as no section of frame is removed until after the new is in place.
Here's another thought.