need help with box calculations and any helpful input 12w6v2 noob help

[Junior_Sosa_Nav]

so i had this drawn up its going in a 1998 jeep grand cherokee laredo 2 jl audio 12w6v2's that i baught blown and had reconed by jl audio. first time audio build with good components. been doing car audio since i was 12 but never had good stuff just hand me downs and low end mainstream crap..
powered by saz-1200d at 1 ohm. wanted to know if anyone could verify the cu ft per chamber and tune frequency. also if any has had experience with this type of set up could give input on reliability i really dont want to fry these subs. ive only blown 1 sub out of like maybe 30 different cheap subs and that was cuz i accidently leaned on volume knob haha big BOOM POP... and silence after... also if anyone has any ideas on a better enclosure i would appreciate the help.. this setup will only be for maybe a year planning on getting some sundown z series 15's for personal enjoyment and maybe take down to a competition later on to see how i do