good point on seam placement. I'm switching to using ply for the base material after redoing my countertop made of plywood and seeing how good the condition was at the seams. I've installed postformed miters and the supplied glue (w/ bolts) indicates it keeps out water...not sure how that would work at the to of the seam unless perfect.
would you mind posting a picture of your jig?
would you mind posting a picture of your jig?