That is interesting 
I remember someone asking on the forum about how to build a Slovenian style beehive with the Flow frames. Looks like what you are trying to do. I really like this idea.
Do you have any videos of you doing the brood box inspections? I am interested to see how you pull out the brood frames to have a look.
p.s. would it be okay if I split your posts into a new topic? Building and modification? Or would you like to create a new topic in there so we can track your process more easily with the Bentley hive and Flow Frames?