This is a case design for the Ursula by jimmerricks with optional tenting. The top and bottom pieces fasten with 6mm x 3mm neodymium magnets. The tenting is fastened via M3 heatset inserts.
Magnets: https://www.amazon.com/DIYMAG-6x3mm-Refrigerator-Premium-Brushed/dp/B07KZQGWNN
M3 Heatset Inserts: https://www.amazon.com/gp/product/B09ZNXRD2H/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
3mm Foam: https://www.amazon.com/Neoprene-Adhesive-Padding-Multi-Function-Soundproof/dp/B08RB2FWVR/?th=1
1mm Foam: https://www.amazon.com/gp/product/B07L6KV4QG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
The author marked this model as their own original creation.