Interesting: Mr Millichamp owned a Pou-du-Ciel in 1936 then... designed a twin-boom light airplane in 1939. For me, this stands as a vey proof: twin-boom layout is better than Pou-du-Ciel layout... ;D
BTW, I have added the Millichamp pusher on my twin-boom 1939-45 update:
http://cmeunier.chez-alice.fr/update_FG.htm
Thanks again, Hesham!