How wide is said 30" tire? I'm curious to see what you build up on the inside of the frame. I'm guessing you do that before hitting the outside? Use what's there as a jig basically.
Here's what I am considering:
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The M&H is the beefy boi, and the M/T is a proven piece in much more powerful cars. It really boils down to aesthetics and @ss pain in the way of fabrication to fit. The M&H will demand a wider rear wheel and every inch added is pricey (chopping up the 17" GTA reproduction wheels to suit). There is also the consideration that adding too much inboard on the wheel is going to necessitate a wider differential or use of a spacer. Neither is ideal.
But, there is a certain look I am going for and I won't be deterred.
As for the "how" of the frame notch that is a big problem that starts with disassembly of everything around it. I am dreading that. I need to get the complete inner wheel tubs out, cut back the floor to suit, all so that I can access the top of the rails.
I am thinking of running parallel tubes over and under (inboard) the rails and then I can just go ape-sh*t with the plasma cutter (which I didn't have when I did the wagon) to delete the redundant steel. I am also considering adding in additional body mounts like I did with the wagon as supports - since this mostly a non-structural part (as far as the suspension goes), and brace in what seems appropriate.
This is just me babbling on something I only just looked at an hour ago... so take it with a grain of salt.