Fostes FE206En: Can I do a Le Petit type design?

Hi, I got the Fostex FE206En drivers and am obviously thinking to build the back-filled horn design (in lieu of the double bass-reflex one).

However, I got my eyes set on Jean Hiraga's Le Petit, which uses the smaller 4" F103. Is there any chance I can adapt the design to my F206En's? What are some novel and/or simple designs for this driver?
 
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