3 sa-8 box help

[powerpunchhx2]

can any one help me with an box for 3 sa-8 and the box will be in an 2000 yukon it needs to below the windo line the amp is saz-1500 and the subz are 4ohm,also cant i run the subz coils all pos together and all neg together.what would that drop the ohms too??looking for the box to be in the mid to low 40s hz

[BJD3]

http://www.the12volt.com/caraudio/woofer_configurations.asp?Q=3&I=42#results

Might want to go take measurements. I'm no box designer though.