Try to take the top down below the rounded edges of the original 2x4's. Drawer You can now use your new bench to build the drawer. The drawer should be wide and shallow. The face should be low enough so that you can still pull it open with a plank clamped horizontally in the vise. This will leave about a 2 inch gap between the drawer face and the bottom of the bench top.
Wooden runners work fine for the drawer but make the sides very long.
The top is unfinished so that it can be replaned yearly. The legs and drawer may be painted with based enamel. Anchoring This bench is a little front and top heavy, particularly with the vice extended and holding work. Storing heavy tools on the lower shelf helps but securing the bench to the wall greatly increases safety. Use two lag bolts with washers passing through the top back piece and screwed either into studs or into masonry anchors.