The pictures and measurements are for reference only and taken from South Bay Sedan & Limo Service - Private Airport Limo Sedan Servicing the Greater Bay Area. my car is a baleno without cng so i had loads of space in it. this is the trunk of my car the max height is 13.5" inside width where i want to fit the box is 34".since most rear seats are somewhat slanted, i wanted to have a side of the box slanted to take up that space but it was becoming too complicated to calculate so i went on with a straight back.Then i went to the woofer manufacturer's site and got the recommended box volume from them. in my woofer's case, it was i.75 cu. ft.so next step is to start a good box design program like bass box pro. i noticed that one of the shapes i.e. prism, trunc.edge when multiplied by two gives me the shape of the inside of my car trun. so i put in volume as "Half" of what i want, i.e. 0.875 cu ft. put in the measurements i had and ran to my car to take another measurement i.e. F=6". this gave me the other dimensions i need to make a box of 1.75 cu. ft.next i went to the wood market (City saddar road in Rawalpindi) i figured that a half sheet (4X4 feet) of 0.75" LAsani wood AKA MDF will be sufficient for the box. so i bought the sheet.this is what it looks like from the edge.then i took the wood to a wood worker/carpenter/tarkhaan and showed him the shape i wanted. now you can take it to the audio walas but those guys charge u an arm and leg, are LAZY and wont work the way you want to do. the guy i went to is an expert. his shop is under the westridge masjid. didnt charge me much either. make sure you ask your guy to use screws only. its a good idea to pre-drill the holes in MDF as the wood has a tendency to split. he used long wood screws and lots of wood glue to make the box strong.