I just saw Erics box joint jig, and it made me think abut the one I rolled out last Summer. I used some scraps of BB ply for most of it. A chunk of Ash for the front fence, and some QS white Oak for the 2 runners. In the Summer they ran slick, and easy, with no side to side motion. I just tried it this week before it warmed back up, and got the same in a 68 degree different shop, so I think it's going to be fine for stable. Did my first test cut, and they fit like a glove, so struck by the luck lightening is a good deal. :-)
I've used it a few times since the build, and the projects came off well. It took longer for the glued up pieces of ply for the fence to dry, than the entire build, these are really quick to make, easy, and can be made from some scraps, just go Nike on it if you are looking at making one, and Do It..
That blade in it is from
Infinity Tools in Florida, it's an 8 inch blade that is 0.25" so it makes a wider cut, and has a perfectly flat bottom which is perfect for box joints, drawer side grooves for bottom installs, and to make
1/4, 1/4, 1/4, joinery for great very quick drawers, all of these cuts are better with a flat bottom. It's not cheap to buy, but IMHO it's worth it to a lot of woodworkers, I certainly love it.