Question on box construction

On his drawers, he always makes a groove on 3 sides and slides the bottom in (the back leaves the groove open). The bottom can be either plywood or solid wood (chamfered/rebated on the sides) with a few nails through the back panel, securing it from sliding out.

I think he used the method Joost described for smaller boxes with thinner sides, so they don’t become too fragile, too thin where the groove is.

I was talking about the board that seperates the drawer from the top compartment.

The sticks would be above the drawer, this does create some useless space between the top of the drawer and the top compartment. Another way you could try is make a groove in the walls of your box. You can then slide a floor in there before you glue up the whole box.

I suggest you watch the desktop organiser video, it sounds like your trying to make something like that project. Last time I checked the video isnt part of the subscription so it should be free.

The drawer needs something to run on top of, but it also needs something above it to keep from flopping downwards when you pull it out. So, there is often a narrow batten above the drawer along its entire length (depth?), running front-to-back across the depth of the cabinet. On simple pieces, this will literally be a batten attached to the side of the cabinet, one per side. Screws would be used with the back one in an oversized hole to allow wood movement. On other pieces, a frame assembly might be made.

In any case, this element provides a resting place for the separator you are asking about. In something like a tool chest, you might just cut a rectangle of ply and let it sit on top of the battens. In a fancy chest of drawers, the frame mentioned before might be frame and panel. There’s no reason why you couldn’t build a frame for a blanket chest to go above the drawers and just plop a piece of ply on top of it.