Having trouble with many of the images in the diy website. Tried everything
The majority of pictures are viewable if your logged in as a registered DIYAudio user. There are still some pictures however that you should be able to see regardless, like the first few build pictures, finished cab pictures, and some screen shots of HornResp and the WT.
Is it this sub:
Yes, it is...as it is part of my signature below, referenced to in the information section of the linked videos, and also referenced in the title of the build thread on the DIY forum.
It looks like it would fit well between two studs with the mouth into the room
It's an 18 x 19 footprint so most likely not if you're already 16-on-center. But, there's no rules that say a person couldn't build a wide spot to allow it to slot-into a wall or corner.