That's dodgy as, all but the top right weld are pretty much birdshit cold welds too. The top right seems like it got some heat but will have cracked easily once the others went. I agree that the bottom should have been stitched and would like to see far more weld in the vertical bracing.
Having seen one of the original fishers under construction when I repowered my tinny, that is nothing close to the quality they use to build. Shame on Noble for ever letting that out of the factory.