Okay, so I decided to mock up a test, since I remembered I have a 6' long 150 gallon tank in my garage (going to be the future sump).
So I used a dollar store plastic container, and an MP40 to build a wavebox, and mounted it near one end, blowing towards the front of the glass...
http://www.youtube.com/watch?v=Kl0m2XwA_-Y
I may do other tests/videos since I haven't found much about this type of design anywhere, and it is seemingly brilliant for having 3 clean sides with a long-back-mounted overflow and now wavebox!
Hope this helps others!
I will update this thread if/when I do more testing. If anyone wants a specific test done let me know (I don't have any more spare pumps though
)
Craig