I like the idea of your boomer box, but only have a Jobe backpacking (foldable) sluice.

I think the interior width is just shy of 8-3/4".

How can this be made to fit my sluice? Or are you able to make a smaller version ?

Hello Slow walker. I have been to Red's shop and know that he can reduce the size for you. The Boomer is quite a cool idea.

Mike