Frame removal and repair - broken front hinge, 64 Dart

I'm working on a 64 Dart convertible (see thread in Members' Restoration forum).
64 Dart Convertible rescue

In the process of getting the top unstuck, I managed to break the frame on one side, the area around the hinge pin for the front section. One side loosened up, the other cracked and broke loose. Guess I'll be removing the top frame and getting it welded.

What I SHOULD have done, and will do on any convertible tops I work on in the future, is remove that front section hinge pin first, by tapping it out sideways, before attempting to get that hinge free.

There's nothing like breaking something, making it worse rather than better, to make you feel like a bad mopar parent. But, lesson learned, and I'm owning up to it here just in case it saves someone else the grief of doing what I did.

So it looks like I'll be removing the top frame. I searched the convertible forum but didn't turn up much detail on removing the top, except the advice to drill a pair of guide holes on each side for realignment on reassembly.

How exactly are you getting at those frame mounting bolts? They seem buried in there, any tips?

Once it's out, I plan to take the broken cast aluminum (?) piece to my local welder and see what he can do for it. Looks like a pretty clear repair, to an area that's neither super weight bearing nor hyper accurate. Hoping that will be a straightforward weld and I can get it back together, back to the starting point again!