Troels, 
Well the Ekta 7741s are done and likely broken in.  Very pleased.  I had a build like your Illuminator 71s, the NADAs.  I opted for similar drivers and got  the Be tweeters.
Was worried id make a mistake on the XOs. I don't think so. The completely disappear when set up right.  
Thanks for answering so many (sometimes obvious) questions!
Ebels cabinets are so easy to make work.  
Vernon