Bought a mess - are these welds ok?

[Mgicm]

So I am ripping apart (still) this 51 on s10 debacle I bought a while back. Looking at the frame it appears it was cut and rewelded back together with some huge plates. Since this is probably the best place for advice, I was hoping you guys could look at these photos and let me know if this is safe, done ok or I should get a new chassis. Everything seems to line up bodywise (fender openings) but if not safe I will scrap the frame.