sounds like a cool build, but have you considered any other mantises?
if you wanted something smaller and maybe a little less beautiful, you could go with Pseudosquilla ciliata
but one mantis to really look at is Gonodactylus smithii. smithii mantises are very beautiful,
and i know I've seen some that look alot nicer than peacocks. we have a really cool blue one at our shop right now actually
just something to consider