Made my own design for an ikea one
its a half billy with a glass front
about 120ish
then about 10 for extra pegs
another 15 for 5 sheet metal trays scratch built.
if i take out all the books i could get far far far more into it. and its variable positions so i can fit big and smaller sized models on each shelf
Edit: i have a detolf but it lets dust come in.
you need to put in some work to make it dust proof.
you can also add more shelves to it using cable clamps and extra glass though i know there are some guides to do it.