I like the boxed in lower rad support as well. Great minds think alike. I did a similar job w 2x3 boxed steel, and notched out and reboxed in the notch with the piece i cut out, by flipping the cut out piece over and reinstalling it with a couple end plates. this way the radiator can sit down in there and the lower support could still tuck up in tight. Then i trimmed down the original sheetmetal lower support and fit the top of it back in, and modified the bottom of the grille and hood latch support to bolt into the new lower radiator support. And yes theres a crap ton of spotwelds holding that cheesy piece o crap in there. Dont forget your drain holes. I did mine w a 3/4" blair cutter.