What intrigue me about the 8pi is the front loaded woofer and how you control directivity. it also have the look of the Klipsch Lascala. Which a like. You know it may sound good but you still have to live with it in your living room...
The design of the 3pi is something that seems more popular (smaller size maybe...). Both are quite tempting to do.
Did you send the plans to my email and is it accessible for you?