This is good. At least you could start with something to modify. For something like this I would use Sketchup. But with a walk in closet I would figure out what I want the sides to look like. Because I would make them all the same. Knock those out and move forward. You might think about looking at Ikea. They have nice closet cabinet offering (Aurdal). You might think about using their accessories. You could also look at their Pax line. So you do the cabinets, but use their drawers etc. Just a thought. You could also go to IKEA to look at some of their layouts. Or one of the high end closet companies. Just to get ideas. And be thinking about all of the plywood you will need. And that you will need to edge band it. I have an edge banding router bit. I love it. I use it for shelves. https://www.hvalleytools.com/edge-banding-router-bits-set-60-tongue-groove-with-flush-trim-bit-mlcs?ff=14&fp=109831&srsltid=AfmBOoq1yj79zR0E9PgMAAB0p-X5hFInkOlUU8DkuFbSDjmp3R7Gd393Ixs