Thanks for the advice, I will do that when the fenders are off. My biggest fear is that the lap joints I created will rust out eventually, but like you say as long as I keep it clean and dry it should last for a long time.
If you used weld thru primer, that's all you can do, the whole car is put together with lap welds, lol.
If you didn't you'll be able to get extra protection on your fix spraying zero rust thru the cowl, and the fender access points, as deep as you can with a straw and good light. Should help with that pesky piece of mind. I feel your pain.