Metal planes made from sheet metal are typically made with “double” dovetails, basically the metal is deformed (with a hammer) in two planes to hold the sides to the bottom. First, tabs and slots are cut so sides and bottom slide together. Some do this with a hacksaw and files. Not this boy, I have a milling machine and am NOT afraid to use it.
The wood serves two purposes: I can squeeze the sides in the vise and I don’t have to worry about the endmill (cutter) grabbing a tab and bending the snot out it. Which has happened.
The tabs are left about 1/16″ long so I can smash them. The front has been left long because didn’t know where I wanted to cut it (before bending).