Automatic Toilet Lid Opener Prototype

I am looking for a mechanical/electronics freelancer who can build a simple working prototype of an automatic toilet lid opener that mounts to the back of the toilet tank using 3M tape.

The device should:
• Use a small DC gear motor
• Push/pull a linkage rod connected to a clip on the toilet lid
• Use an IR proximity sensor to detect foot/hand wave
• Auto-open the lid when triggered
• Auto-close after a set time
• Run off AA batteries
• Be housed in a small project box
• Be universal to all standard toilets

Deliverables:
1. Fully assembled working prototype
2. Video demonstration (opening/closing function)
3. Simple wiring diagram
4. List of all parts used (BOM)
5. Simple explanation of how to adjust the linkage for different toilets
6. Optional: 3D model of the housing (bonus)

Budget:
$150–$300 depending on experience
Timeline:
1–3 weeks

⸻

SKILLS REQUIRED:
• Basic mechanical engineering
• Arduino/electronics experience
• Experience with gearmotor linkages
• Experience building physical prototypes
• Basic 3D modeling (preferred but optional)

⸻

NOTES:

This is NOT a complicated device. I don’t need perfect aesthetics. I only need a functional prototype to test the concept.