Frame for dual two acryl sheets, between them is rail around for LED-strip. For the LED-strip rail is base, where you can make silhuette, just find 2D picture ex. Pixabay and print it, thickness 4mm.
Sorry about the *.stl orientation, but I´m sure that you can figure it how to print them.
You need to print:
Frame vertical 2pcs.
Frame horizontal 2pcs.
Top corner 2pcs.
Bottom corner in (hole for wire) 1pcs.
Bottom corner 1pcs.
Silhuette base 1pcs.
Owl silhuette (if you don´t make own) 1pcs.
Silhuette feed size for base: 4x20x6,5mm
Acryl Sheet: 4x250x200mm
Led-Stripe width max.:10mm