As it is, the patch comes pretty close to the angle iron, and would be a bit of extra work trying to clean up with whatever filler method you used.
I would suggest you remove the patch and continue right under the angle iron edge. This way you will only have two sides of the patch that you will have to dress up, the other two will be normal seams and hidden from view. It could be spot MIG welded from the inside onto the angle iron edge and would look good from the outside.
I've used lead fill a couple of times in a very amaturish way, and got fantastic results from it everytime. The heavy metal on the CMPs is great for the lead filling as you have less warpage to worry about.
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