question for air bag guys

[cstm68]

so i have looked into lowering my 68swb. my plan was to go with 2 1/2 drop spindals with front disks and convert the whole thing to five lug for a set of hopster 550's
for the rear i was planing an 5'' drop coils and 1'' blocks.

now i am having 2nd thoughts, i wil stay with converting it to 5 lug with disk brakes but i am now trying to decide if i want to air bag it all the way around.

my biggest problem is that im only 17 so money is a slight problem.
i would just like to get it lowered for now
so is it possible to do all the 5 lug stuff and brakes first then later put in all the airbag stuff or shoud i just do it all at once?