Sorry to bother you with another question, but better safe than sorry when it comes contruction. If you don't mind could you please clarify the 15 1/8" dimensionon the pro pi7 plans. I am thinking that it is the distantce from the outside of the cabinet to either the inside or outside of the port (the piece of plwd that defines the length of the port). If this is the case, I was trying to determine how this configuration would result in a port length of 12" as determined in the pialign program. I noticed there is an adjustment of lenght due to area, but I could not find a formula for calculating this adjustment. Also, for a port that "turns corners" like the one for the pi7, is the adjusted port length then measured along the centerline of travel through the port?

Thanks again for your patient answers.