Mini tubs, advice, do's & don'ts?

Cope said

I may just plasma up from the bottom right next to the frame just to make sure I get the right spot.

I'd like to keep the trunk hinges if possible?

Yeah, I'm gonna lower the car over the wheels and tires once the inside is cut free to figure out axle width.

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I used a plasma cutter on mine on mine too, I also used a blair spot weld cutter to drill out the spot welds along the bottom of the inner part of the wheel well. Once the inner is fitted I plug welded it to the frame rail through the holed left by the spot weld cutter. If you're careful you can cut the floor so no patch panels are needed. instead of folding the frame flange I cut mine off flush.

Yes you can keep the trunk springs. My 69 has a recess in each inner half of the wheel well, that's where the spring bracket will end up. If I were doing it again I'd use a string to find where to cut the bracket. I cut extra off mine then added what it needed to land on the wheel well once everything was tacked in. The blair cutter was used on the spot welds to remove the remaining part of the spring brackets.