Box build

[Music is life]

Hello I have been doing a lot of research into building a custom ported box with the subwoofer firing up and have come across this site several times with ideas and sketches that are very very impressive ... and help would be truly appreciated ... I have a Memphis BRX1244 (12 ) inch and would like help or even better if anyone could draw me a ported box with the sub firing upward and if possible tune between 32 and 35 hz .. the subwoofer requires a 2.75 cubic ft box ... I HOPE SOMEONE HERE CAN HELP ME ... I FORGOT TO MENTION I HAVE  ... 16 HEIGHT  ... 27 WIDTH ... AND 20 DEPTH I CAN WORK WITH OF AVAILABLE SPACE I CAN SPARE ... WOULD GREATLY APPRECIATE A DESIGN ANYONE CAN MAKE ME WITH A ' L PORT AND SUB FIRING UPWARD ... THANK YOU