I'm helping my dad with one of his woodworking projects where he is making a credenza with sliding doors that have narrow slats in the door frame. To give you a visual, this piece here has doors that look very similar to what he's trying to do. https://www.allmodern.com/furniture/...000244447.html

We're trying to figure out the best way to attach the slats to the inside of the door frame and are thinking that we'd like to use dowels but are stumped on how to best dowel the actual slats as they are thin and narrow. The door frame itself is straightforward. I want to say the slats are about 3/4" wide by 3/4" tall max. Is there some type of doweling jig specifically for pieces like this that I'm just not searching for correctly on google? Also, we're open to other suggestions on how to attach the slats if there are better options. Thanks!