inspect my cage. any safety issues?

['85 LSX c10]

So i just got an 89 s10 blazer 2wd and am going to to a turbo ls swap and hope for about 700 whp i also recently bought a tubing bender and bend tech and i wanted to knwo what you all think of my cage, i have it set up so i can still have a rear bench seat or possibly even two racings seats in the back if you see any major safety concerns please point them out.