Display Case for Building Block Helmets

This is my first fully self created model. It is designed for mt collection of Star Wars building block helmets to avoid them collecting dust. The Acrylic sheets can be found here - https://www.amazon.com/dp/B0BPXR58GN?ref=ppx_yo2ov_dt_b_fed_asin_titleNOTE : Darth Vader does not fit. I am sure there are ways that this can be made more efficiently and I am open to all comments.