Hey Trevor...
I just finished my pan and there are a few must haves...
Fuel line, personally I would suggest to scrap the hard line and run braided line(-6) through. It is way easier and not that much more expensive.
After powder coating the pan I would still run sealer over the pan half seams.
You need to cut one hole near the front (opposite side of the pedal assembly), cut another on the passenger side just behind the shifter.
I don't think you need to brace the pan any where. The frame horns will take the most abuse. Your running a brace bar which is good, the only other one would be welding in a mid mount to support the tranny(I think Geoff made some up).
Aside from that just depends what kind of fuel system you are hooking up as well as any extra needs like wiring your ignition box, etc... I would lay it all out on the pan, figure out all your routing and then cut you access holes and tabs. It's also a good time to make a battery box mount/ hold down, you'll need that when you go to the track.
There's a few basics... good luck