Hard to make a judgement call over a picture, but here's me. I would consider squarely removing a larger section of floor. Don't beat it out with an axe, I'm talking fine cuts with no overcuts. You can build tabs later to the underside of the floor, around the outer perimeter, and when the set, the floor will lay back in nicely. One of the bigger mistakes I see with an owners repairs are, it's not that they can not fix it; but they are doing surgery on their baby and do not want to cut any more access than necessary. More often than not these cutout/access holes are to small. Tear your hands all to hell trying to do a job in a hole that just don't fit. And then some go ahead and make the hole bigger, which further compounds the problem of sectioning back together two or even more pieces. Trust me, try and make sure your access hole is plenty big enough. And if it is NOT big enough, the structural repair will start to suffer as well, because of, again, you can barely get to it.
As far as the repair in the bilge goes, I don't know, but it doesn't strike me as all that bad. I've put 'em back together that busted worse than that. If you worry the structural, consider a spider of sorts. I know these things are long held up to yacht designers, thereby like a lot of things on the boat, people are afraid of it thinking the pro is the answer. Sometimes it is. But consider a light sufficiently tapered spider. Once you glue that sucker in you can rename your boat, "The Reef Breaker".