Interesting reading about Seabees in North Africa. Amongst my current reading (am usually reading a few books at a time), is the book, An Army at Dawn. It's a great read. Much detail, however as in most books, combat engineers and engineers in general are given a sentence or two amongst a few hundred pages. Every now and then (emphasis then), you'll find a paragraph that contains a sentence exclaiming, combat engineers led the way. That's about it.
But, your mention regarding Bizerte, Casablanca, Safi and Fedela stir great memories now that I've gotten my hands on the history of the VI Corps engineers. So your post is very timely and inspiring. I am glad that you took the time to place it here to make people more aware of the role of engineers even in North Africa.
The beginnings of the birth of the Baileys is worth mention too. What a great British invention. Baileys played a signifigant role in WWII. Without them, the war would have turned a different tide.
Thanks for your efforts. I do read them all. 
Proud Daughter of Walter (Monday) Poniedzialek
540th Engineer Combat Regiment, 2833rd Bn, H&S Co, 4th Platoon
There's "No Bridge Too Far"