Making riffles

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3mm thick abs. A riffle section for tail end of high banker/sluice box. All riffles have a 3 to 4 mm overhang.
 
Looks like you could just glue sides on to make a Mackirk style sluice, or are you using them in a channel?
 
I will make the whole thing out of abs and weld into one peice so for clean out will tilt whole thing up and rinse out.
 

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