I could be jealous, but haven't had the reasonable space to attempt that, and likely not for the near future. But I make do...*G*
You're closing "...have the satisfaction of being able to literally build the speaker to fit your room" suggests you've gone to my page...
I've had decent success at shanghiing innocent drivers into Walsh radiators, enough that others like what they sound like as well as what they do.
The posted pic is ancient by now, I've improved upon the look as well as the starting point(s)......multiple pairs at this point.
It's fun to run them in a 'surround' layout, funny things occur even in 2 ch.
Actually working on something that could work in any room with a DSP massage. Wish I could expend more time in play, but as 'co-owner' with spouse of a expanding business holidays, weekends, and actual retirement are more concept than reality for awhile yet....
Anyway, cheers, Jerry