I decided that I'd match up the supply and ordnance storage capacity to the same ratio as it exists in storage components.  That is 25:10 supplies to ordnance.  I'll also match up production to this same rate.
Each Cargo Facility will provide a base of 25000 supply storage and 10000 ordnance storage, up to a max of 50000 supply and 20000 ordnance.
The new numbers for v1.12:
Code:
Breathable:
         Pop    Facil   Cargo   Supply   Ord
Tiny     500    5000    5000    125000   50000
Small    1000   10000   10000   250000   100000
Medium   2500   15000   15000   375000   150000
Large    5000   20000   20000   500000   200000
Huge     10000  25000   25000   625000   250000
Ring     25000  100000  100000  2500000  1000000
Sphere   50000  200000  200000  5000000  2000000
Domed:
         Pop    Facil   Cargo   Supply   Ord
Tiny     100    1000    1000    25000    10000
Small    200    2000    2000    50000    20000
Medium   500    3000    3000    75000    30000
Large    1000   4000    4000    100000   4000
Huge     2000   5000    5000    125000   50000
Ring     5000   20000   20000   500000   200000
Sphere   10000  40000   40000   1000000  400000