Here's the schematic for the box shown a little earlier, and for which the distortion plots were done. It seems to work (at least in PCD) for either the Eminence DeltaLite 2512 or the Eminence Delta 12A. Measurements here are with the 2512, at about a meter, indoors, on the tweeter axis, 1/6th octave smoothed. Woofer and waveguide are on the same mounting plane, so if you inset one very much, inset the other by about the same amount (or you can vary the insets to direct the vertical lobe a little). BTW, on these designs I'd recommend getting the tweeters up away from furniture height for use, to minimize near reflections off of it all -- sounds better, I use ear level.
A relatively simple crossover (though it has my finicky tweaks on the waveguide). Parts Express part numbers are shown on the schematic as well.
For the 33uF capacitor, an inexpensive NP electrolytic will work fine, but if you plan to have the speaker passed down through generations of your descendents, you can use the $13 film cap instead.
Horizontal Curves, 0 to 90 degrees in 7.5 degree steps:
The dark blue trace (the 7th trace) is 45 degrees.
Horizontal Polar Map:
As Erich mentioned, the woofer hole was cut too low, so CTC is about an inch and half further than it has to be. Anyway, here are Vertical (Up) curves to 30degrees. Flat response is a bit narrow in the vertical, but that should be better when the drivers are moved closer together.