Dimensions for ext. cab 1999-up sub boxs

i was wondering if any of those people that built their own sub boxes for their 1999 and up extended cabs had their dimensions for it still?

my friend is looking to install either two 10's or two 12's in his 99 ext cab and planned on building his own box. instead of taking th time to measure it all out if anyone had dimensions still it would save some time.
thanks for any help you can give me.