Well, its been a while so I will take a stab at it.
That is one big puppy! I have never even seen one that size. Probably too big for what you have to work with. It is going to use a lot of power just to turn itself (bearings losses, etc.). Next is that it will not turn very fast, so it will need geared up, and that is more losses. I am prone to think something considerably smaller, easier and cheaper would give more power out.
I don't believe you flow and head are very suitable for a cross flow Michell-Banki turbine even close to this magnitude. I could be wrong.
The water you have is not bad at all. I wish I had it. There is potential there.
The best bet would be somthing a lot smaller like this, but stepped up a bit...
http://www.otherpower.com/otherpower_experiments_waterwheel.html
Possibly thats what you saw, but I think it would produce better than fancier, or factory made units. There is room for improvement I'm sure, pulley ratios, different generator, make all the water entering the wheel, aim the water inside the wheel better toward the fins, close some loose tolerances in the blower... stuff like that. Cheap and easy.
Compare the 'output' to more expensive (factory) or complex units using the same water conditions.
Another turbine.
http://www.otherpower.com/scotthydro1.html
And the main hydro page by our hosts...
http://www.otherpower.com/otherpower_hydro.html
Go for it!
G-