Layout of the tank inboard rib - 1 hour

This is something that I have been scratching my head over for a couple of days. How best to layout the stiffener ring and the tank bracket. The main concern I have is if I need to worry about edge distance to the tooling holes in the rib when I drill the new holes.

 I can rotate the stiffener ring so that the tooling hole is centered between the nutplate mounting holes, but then this affects how my anti-hangup guide attaches. I may need to research this more.

I also need to pay attention to how much clearance I have with the T-405 tank angle with respect to the rivets that will attach the skin. I think it is best that I locate the AN470AD4-7 rivets such that I have enough edge distance in case I have to grind down the tank angle to allow clearance for the skin rivets.

Next challenge is the fuel flop tube hole with respect to the other tooling hole in the inboard rib. Its quite close...hmm.