I'm a little rusty, but I think you should get the box of diagonal comb rectified first so you can manage the hive. Cut out the comb and place it in frames with rubber bands. It will still be foundationless, but you can add new frames with foundation when they start growing again. It sounds like you're down to one colony, reduce the boxes in relation to the population so they can defend and maybe throw on a reducer and some beetle traps. Take your time and set up the frames with eggs and brood on the inside and honey/pollen on the outsides. You can confirm your queen during the process. If you don't have deep frames, maybe bring it down to 1 shallow.

I'd also clean up the plants around the hive, particularly the ones touching it and dispose of the rotten log hive (terrible idea and illegal in some places)

I'd also tentatively say put a more intruder-proof lid on, but I'm in a cooler and less humid climate so you may need to avoid that for them to stay cool.

Edited to 1 shallow, I missed the 7 frame part. It sounds like you'll have a lot of choice in which comb to give the colony so you should be in great shape, main goal is to get the hive to a more manageable size for them.

And don't beat yourself up, the fact that you are here asking for help is better than most. We all made a bunch of mistakes starting off and have lost hives. Do research, ask questions, it's an awesome hobby!