This is how it is supposed to look.
A sideways closeup of the clamping arrangements.
You try to not use too many clamps, and also as light as you can get. Sometimes those cheap Chinese clamps are really heavy....dont use those. The heavy metal will suck all the heat away from the assembly. You see that little chunk of metal on the top? That's a scrap of solder. When it melts, I know the whole thing is warm enough to fuse together.