In May 2011 I wrote that I am going to build my first Open Baffle Speakers with Saba drivers.
Now six months later I have finished my first speakers' project and I am very very glad.
I choose the Open Baffle design for it's simplicity but added a bass extender. It works great!
Cross over is very very simple and effective. Here's the schema:

Left speaker
Right speaker
Open Baffle in its glory!
Speaker's body after painting and polishing
Back side after wiring speakers and crossover
Bi-wiring to the amplifier
My final decision: the best speakers I have ever had under 500EUR!
They sound like new 3000EUR Jamo and maybe better clarity.
Yes. That's right! :)