Bag ideas

[54Caddy]

I am planing on bagging my truck, I have a few questions that i need answered so lets see if you guys can help me out.
1. What size bags do i need up front? have a sbc
2. What size bags do i need in the rear?
3. Will a 5 gallon tank be enough?
4. Should i run 1 or 2 compressors? Don't want to have a long fill time
5. How would i run hard lines instead of the nylon style?
6. Will my 1 piece driveline clear the frame with the bags aired out?

Here are the plans, I will run a 3 inch drop spindle up front with upper plates and lower cups (Might cup the A-Arm not sure yet), Out back i will flip the axle either with a 5 or 6 inch kit with the way it currently stand and use a helper bag that is mounted outside the frame to lift it up for ride height. The rear currently has a 2 inch drop shackle and only 3 leafs, for the notch i will weld in a pipe instead of ordering a bolt in c-notch. The plan is for me to just lay low when i park and not have a hole in the bed because i still use my truck as a truck. I will be running stock 7 inch steelies with 245/60/15 TA's mounted on them. Im thinking it should lay out on top of the rims in currently have if i measured everything correctly. Any questions answered will help and i appreciate it.