Wanted to put three or four hours in tonight, but I over-countersunk the splice AND reinforcement angles. Pretty sure I will need to replace both parts.
I also found a center rib that was drilled too close to the edge by the previous owner. I also think that parts he messed up were marked in blue. I wasn’t told this, and there are no replacements.
So, I stopped for the night. I’m very frustrated and angry with myself, so I’ll cool down and approach the problem fresh tomorrow. I will also try to get a second set of eyes on it.