Here's a few pictures of the clamp bracket assembly.
This is 200mm long. The inner width is about 31.5mm (to allow the bar to slip in between)
The holes that need drilling (3) from the left of the picture is centred at: 15mm, 127mm, 185mm.
Ron, If you could produce something like this, I'm sure You could sell a few, once You put the word out, do a few demonstrations. These things really work, and well!
Last night I checked the dealer that sold me my two sets (they retail at over $500 a set here

)
I was shocked to find that He no longer stocks them

I haven't found anywhere else yet, that stocks them...so I might be making some too

The place I bought them from is:
??????????? Web Shop >> ?????????????
Cheers!
Okami