Some things that are hard to think of - or find.
These black Nova Torx screws are great for screwing wood to metal. A nice finished look without countersinking.
Plus-Nuts. Basically like Rivnuts but far stronger.
https://www.amazon.com/gp/product/B011A4BRV0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Install tool.
https://www.amazon.com/gp/product/B011A4BRV0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Drill install tool. Sigma #GM21 ULTRA HEAVY DUTY 2-in-1 Riveting Drill Adapter Cordless or Electric power drill adaptor alternative air rivet tool
https://www.aliexpress.com/item/4001195205668.html