first coil


I am in the process of building my first coil with the following specs:

secondary: 4 inch pvc with 900 turns of 24 awg wire.
primary: 15 turns of 3/8 copper tubing
input xfmr: 12 kv 30 ma

I plan on starting with salt water caps and would like advice on the
best configuration to achieve capacitance close to 066 mfd.  I am also
not quite sure how big to make the torrid for my top load.  Any advice
would be greatly appreciated.