My experience with transmission lines predates computer modelling, so its usefulness may be limited. But as an enthusiastic amateur I built somewhere over fifty different transmission line designs, most of which sucked.
The problem with a transmission line is this: At the frequency where the path length is equal to one wavelength, the sound emerging from the terminus is 180 degrees out-of-phase with the frontwave so you get a cancellation notch. You can reduce the depth of the notch by stuffing the line, but then you also reduce reinforcement down lower.
You can use geometry to help a bit; my best transmission lines had the diver about 1/3 of the way down the line instead at the end of the line. Or even better, use two drivers each a different length down the line, with the midpoint between the two at about the 1/3 point. This spreads out both the reinforcement and cancellation a bit. Also, the farther apart you can get the woofer(s) and line terminus, the better.
But in my opinion the best results came with using a driver that has a fairly high Qts and thus will normally give you too much bass, and then using a lot of stuffing in the line. This reduces both the depth of the notch and the amount of reinforcement down low, but since you're starting out with too much bass to begin with both changes are in the right direction. I would suggest a Qts of .45 to .70, generous cross-sectional area (if you want a compact box then build something else), and a lot of Polyfill.
In my opinion the woofer you linked to is unlikely to give satisfying bass in a transmission line.
Duke
