Just expressing my wants to help Erich judge market demand...
I want to build some LCRs, so I'll want three SEOS-12 (or -15) waveguides. For aesthetic reasons, I'd prefer to build with the less-wide SEOS-12. I hope it doesn't come to this, but I could probably use the -15 if the -12 gets neglected and all the designers focus on the -15.
Plastic appeals to me. I'm more comfortable with it as a material, so I know what to expect when tightening screws, etc. It also seems like it would be easier to get identical replacements if I need them in the future, or to get more waveguides if I want to make surrounds. I'm not anti-fiberglass, but if both are available, I'd likely pick plastic.
I will flush mount the waveguide. I'm guessing that most people who care about the aesthetics will flush mount. Those that don't flush mount probably won't care that much if the edge is squarish. (Or maybe the sharp edges would be an acoustic liability that people will care about? idk)
Alternately, the waveguide + baffle combo unit could be cool. I plan to build tower speakers for aesthetic reasons (think Zu-ish in shape), so it would be at the top of a tower. My center speaker will be short, though. Perhaps the wg+baffle could provide a common aesthetic among the three?
Much like I did for my Econowave SRs, I just want to follow a recipe. That means I want to buy the horn/CD/woofer and build a crossover that someone else designed to work in combination. I won't buy the parts until someone shares a design that seems to be well regarded and that I know I can execute. I know that many really enjoy the measuring and tuning, but I just want to build stuff and end up with some good speakers.
Making them look good will be enough of a challenge for me at this stage in my DIY career.
I like my Econowave SRs a lot, but I think the D220Ti CD can be a little edgy sometimes, so I am interested in trying the DE-250 CD. Or another higher-end CD.
I'll buy whatever woofer someone decides to make a crossover for.
I do like the idea that I could re-use the waveguide and try some different CD/woofer/crossover options later. It would be great if we end up with several designs clearly documented across a range of price points, much like the Econowave PCD thread over at PE. As a "recipe builder", I really liked that for the Econowaves. It made it easy for me to "dive in", even though I ended up switching from one design to another after I started the project.
That's my take. Thanks for all your hard work on this stuff!