Wayne actually has very competitive pricing, so I would direct you to him for an estimate. Items you will need are: H290 horn, PSD2002, crossover. I think this set up will get you 85% to 90% there to what the Theatre PI's have to offer, without starting from scratch on another cabinet.In terms of crossover, Wayne should be able to help you with that too. It's a variation of the crossover used in this 3PIs and 4PIs. He'll put together network that includes a 2nd order low-pass, 3rd order high-pass at 1600Hz, attenuation to match the tweeter with the woofer, and compensation for the tweeter in its upper range. You can download a detailed description of this network from his website a www.pispeakers.com.
As for fit, look up the dimensions of the H290 horn on Eminence's website: www.eminence.com to determine if you have room. Like I said, I followed the orignal plan exactly and was short 1/4" between the Alpha10 and top panel. Frustrating cause it was only 1/4".
Not much to show photo-wise. Imagine a horn sitting on top of the Tower. However, if you can fit the horn on your front baffle, it might look something like my Theater 3's.
Gar.