To make a bits box when you've got no money, you gotta get creative.
More stuff:
https://miscast.co - My products and free things
https://www.patreon.com/miscast - Support me directly
https://miscast.creator-spring.com - My merch
https://instagram.com/miscast.co - Social
A good bits box was essential to making my nurgle diaries series and just about everything else I've ever done related to miniatures or props or kitbashing. Hope this helps.