Looks great! The only things I would recommend is the following:
Make your substrate at least 6" or three times the height of your largest crab (whichever is deeper wins), throughout the tank. After that minimum depth is met, then you can make differences in your substrate. Also - just want to make sure you mixed with dechlorinated fw or dechlorinated msw to make it sandcastle consistency.
Crabs love to dig, and they love to climb - which leads to my second recommendation: do you have any pesticide & fertilizer free trees that are on the safe food list in your yard? You would also need to make sure they do not spray for mosquitoes in your area. For example: Oak, Maple, Sweetgum. If so, give them some branches

You can also purchase Cholla. Make sure that it is also pesticide, fertilizer and cleaned without chemicals. They are also called tree crabs.
You could use command strips to drape your fish net across the tank too

I personally use the velcro kind.
Edit: Mlakers is a member on here - she makes those feeding dishes.

She has a store on Etsy. EarthWaterFireStudio is what I think it is called. If you go to my link, and then go to my profile, hers is one of my favorite stores.
