Vented Enclosure design?

WinISD doesn't know how many bends the port goes through.  It only knows the dimensional port size.  Good to see you are using the tools you need for vented enclosures.  It doesn't seem like you need a friend to design your box. (??) 

Use as few bends as possible and try to keep the port opening as far from the driver (on the inside of the box) as you can.  If you can run this port down the side and along the back, that would be the best way.  One bend.

I would probably do something like this, which smooths the bend.  Measure length through the center.

Also, I double-checked the math on the port volume because I wanted to remind you to deduct that from the box volume to find the proper response in WinISD.  The actual air dedicated to the drivers does not include the air in the port...and the walls that are built to contain the port take up displacement as well.  You have to find the total volume of the port structure and deduct that total from the box internal volume.  That becomes the new box volume.

By checking the port volume for the simplified diagram I posted, and with your specs as given, the port volume is .9 cu ft.  I would add a bit to that if you slant it at the bend as shown.  That math is:  port height X port width including baffle X port length.  Divide cubic inches by 1728 to get cubic feet.  Reduce the port length by 3/4" for the thickness of the front baffle which the port goes through.

Use inside box dimensions.  Your diagram is not clear whether the measurements are inside or outside.

Here's the message i'm trying to put across to you and then I'll be done.  Double-check your math.  Know that a port volume includes the port walls when it comes to finding total displacement.  Avoid multiple turns and bends in the port. 

Cheers!