No little too much. D3 is their sunlight supplement. Should do it once, maybe twice, a month at most.
As said calcium can be done almost every feeding. Be careful your crickets are not ghosties lol
I give my multi.Vitamin once a week. Some people do it every other week, But just can't be...
You should post how big the pieces you cut were! Looks awesome and I actually want to make a similar cage this weekend.
Also what did you use to paint/seal the pipe?
I use push pins. Stick them in from the outside into the branches. I also use a ton of twist ties.
Id use zip ties but I like to take his cage apart to clean it ever two weeks. Be a shame to have to cut them each time I wanted to take something out.