Dimensions roughly 12, 17.5, with a 7.5 foot ceiling. I can't wait to try your panel design, but your beep bass plans call for an 8' high panel. If I were to drop the height to 7.5 or 7' on the deep bass panel would it make much of a difference?

Would decreasing the other measuresments in ratio help as well?

I tried out that cool little modecalc program, it allowed me to really play with the dimensions rather than study them. 7.5 being the max height I can reach, I got some modes close together at 100 and 200 for length and width. If I chopped off a foot from the design would it still catch these frequencies or should I double up the fiberglass thickness, or use thinner front panel wood.

Another question, I've read that moving your speakers, backs facing close to a front wall, will help reduce low and mid cancellation in the front of room because the wavelengths are long enough they're not noticably cancelling, allowing for a little eq tweak in low end. How do you think it would sound having the speakers this close to a mid absorber. Im a little confused as to how to calculate the ideal distance as well. Ideally, the start freq of absorbtion of panel, at a distance where that frequency would begin to cancel? I couldn't find the freq absorb ranges of dif panels designs, prob just missed it while reading through. I would rather the speakers be close to the front of room and window, rather than rear of room like some prefer.
The reason for this is, I was thinking of using one large bass trap on ceiling running horizontal, above speakers placed at angle to deflect mids/highs to back of room, and two mid traps-one behind each speaker placed at ideal distance. These mid bass traps would also be shorter than your design.

Finally, as far as windows go, of course more mass is better but. . I was thinking of using clear acrylic plastic rather than glass because I can get it mad cheap at 1/4, 1/8 inch thicknesses. Do you think it will do the job doubled up or should I just stretch my dollar for the glass? I've only experienced super dupper thick windows in professional control rooms before so I'm not sure what is a good thickness or amount of mass to consider acceptable.

Hope this wasnt too much for one read, I just signed up for the forums and figured I'd get out all my questions at once. Cheers for reading all our loong posts.