3 sub slot box esc van

hi all im after some help .. i want to build a slot box incorporating 3x12" 800w mt1207 mutant subs

i know there not the best subs but its what i have for the moment

total box size max tuned to 32/35hz if possible
BASE=L,1270/W,510MM OR 50"/20"
FRONT=L,1270/W,445 OR 50"/17,1/4"
TOP=L,1270/W,370 OR 50/14,1/4"
REAR ANGLE 71*
REAR PEICE L,1270/W,455 OR 50"/18"
this is the external size!!!!

i work in mm normally but looking at forum i c you use inches

i can increase the height by 50mm with a 50mm step in from a strut brace to the top rear of the box . im no good at math so calculating volume etc to get port length is beyond me

USING 18MM MDF

iv built a couple boxes before using the 12"/12" box for a 12" sub

but i want to make this a slot box can any one shine any light my way

used google sketch up to quickly show you what i want http://sketchup.google.com/3dwarehouse/details?mid=69c45bfee52d420b547c7b1f139b9019

i know it needs baffles and ignore the two cut outs on the top .i was thinking of making it with 5 subs originally but the other 2 i have aren't matching so three it is .

like i say any help or if some one could assist using sketch up that would be so awesome .. and ill even tag ya name and post pics of it in action here for others to c how this forum is awesome !!!!!!

 

i have it to 4.91 using box calc

 

yeh 4.91 cu ft m8 thanks for the help m8 using a few forums to try and get some advice your the only one thats answered ..cheers m8 .

looks like the box could be tagged with RANGER svo ...


the box is going in between the 2 jvc subs next to the compartment devider in the front facing the camera...(me)

 

thank Ranger im going to go with the 2 inches tall by 20 inches long. i will post photos of the build and your name on it if it sounds good lol. thanks fella . mick

 

grrr mutant have ruind my plans .

ok just received email from mutant audio they recommend a 2.2ft sq box with a 4" x 13"inch port .

which i work out to be for 3 subs a 6.56 cu ft box or 186 cu ltrs

which i make out to be


so this is the plan



so whats my port length now and is this inside the box planed or external like my mock up??????

 

now is this in the box or external ????????????