These things catch gold very well. If you take it and cut it from the wid side to the narrow side so it is equal width, about 4.5 inches wide. then build a shallow 3/4 inch pine box to hold it in place. Think of using it as a riffle system but leave the back wall. Use the back wall to pipe the wash bar. They work awesome as concenrators. here is a diagram i made for ya.
<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=913127"/>
then construct a box about 2.5 inches high and wide as well as long enough to hold the gutter riffle tray.
<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=913129"/>
The wash bar can be mouted to the top af the back ledge. or you can drill a hole for a 3/4 inch wash bar. I have owned and built many a sluice lol, and suprisingly I was very happy with the way this one worked for concentrates on a recirculating pump. Good luck to ya! Happy Prospecting.