Simple Plastic Enclosure Design -- 3

I need a design for a single-screen vent with a plastic enclosure. The assembly needs to include the following:

- Three components: a plastic casing and a stainless steel screen vent ( I may provide the rough design of screen hexagon punching, only punching for sitting on shaft and bending need to design) and top lid to keep enclose screen while installation.
- A mechanism to open and close the screen for maintenance
- Plastic casing dimensions: 10mm (w) x 75mm (h) x 100mm (l)
- Fireproof plastic casing
- Stainless steel screen: 304 or 316
- Plastic casing finish: Matte
- One tooling operation for each: plastic casing, screen bending, top cover plug

Ideal candidates will have:
- Experience in designing plastic enclosures
- Familiarity with fireproof materials and stainless steel
- Knowledge in determining optimal screen thickness for functionality