I need to put a cutout on each of the 3 shelves and floor. For this I need a template.
 
 After I cut the profile on a template, I locate a shelf on the template blank.

Then I glue a cleat on each side so each shelf has the same position.

I draw the cutout on each piece to guide my bandsaw cut.

The next 3 steps are shown here. Rough cut on bandsaw (middle), route with template (bottom), and sand (top).

Here's a piece ready for routing.

I use the template to provide extra support while rounding over the first edge.

The second round over is cut next.

And here are all four pieces.

Four pieces … wait … I needed 3 shelves and a floor … TARNATION!!! The floor only needs a radius on the top side!!

Sigh

Deep breath

Cut a recess.

Then I square up the corners and cut a patch piece.

Then fit the patch and glue it in.

Then trim the patch flush.

Now I can recreate the cutout. I start with a rough cut.

Then rout the profile with the template. NOW I have 4 pieces.

I wanted to have a similar relief on the underside of the top. This requires a new template so I can use a guide collar.

I planned on using the guide collar with my round over bit (with the bearing removed) but I didn't have enough clearance. So I formed the round over by hand.

Next up will be the doors.