I've worked wood all my life. My dad had several nice tools that I used more than he did (Drill press, table saw, scroll saw, lathe, grinder). I've been on table saw since I was 8 and I've still got all ten.

Most metal work I've ever done was auto body and mechanics. So in some sense the metal work is rather new to me.

Edge Miters
Unless it is a finish miter corner, always leave a shoulder at the point on plywood it makes milling and finish much easier and safer. The inside sides have the miter at the top, I plan to cut the sides about 1/8" short for a shoulder.

The off fall piece of the miter becomes a missile from between the fence and blade. I once saw a piece of miter off fall about 3/8" to side fire out of a table saw and break a 1" thick piece of maple. Attach a piece (clamp or screw works fine) of 3/4 stock to the rip fence face about 5/8 above the table. Tilt blade and set height. Slowly nudge the fence stock into the running blade till your miter meets the points of the cut. The off fall stays loose between fence and saw (keep for glue blocks).

Finish on plywood
Depending on the grade of plywood you use, sanding hollows the surface of the softer grain (light color). Not as bad with birch or better, fir will show the grain waves through many coats of paint and sanding. On edges a nice finish can be a nightmare. But if you coat the edges with a lite coat of Bondo (auto body filler) it will sand up real nice (80 or 100 grit). Since this is a painted cabinet I will bondo all screws, nail holes, dents, joints and exposed end grains. As you work if you mar the surface, pencil a circle around the flaw makes it easier to find when you putty things up later. Wood filler shrinks as it dries requiring multiple applications. Put it on too thick it can take an hour to dry and cracks. Just mix a small amount of bondo at a time (I use an 1 1/2" putty knife and dip out a gob about 1" up the blade and mix well with about a 1/4" of hardener) on a piece of cardboard you generally only get about 2-3 minutes to use after mixing before it starts to harden. The darker your mix the faster it dries, a light pink might give you up to 5 minutes. Let it sit for about 10 minutes before sanding and milling.

Glue blocks
A good use of all the small wooden scraps and miter off falls is to glue them to inside corners. It greatly increases the strength of the joints and helps hold things square.

Well long enough break back to the drill press....

If I can't screw it down, I can always screw it up!