sp4 box, building tuesday, will i be doing this righ?

[ncc74656 2]

http://imgur.com/a/lNcLR#0

 

i have two sets of images its this album. a 33hz tune and a 36hz tune. i intend to build the entire box minus one side (leaving it to be held on by only screws) and change out the port as i test the subs volume. once i have things set ill glue on the final side.

 

i would greatly appreciate it if someone would check my math and offer and criticism on what i have laid out here.   thank you very much.