CAD Design for Snowmobile Trailing Arms

I need custom snowmobile trailing arms designed in CAD for milling from solid 6061 aluminum.

Requirements:
- Provide CAD files in the most suitable format for milling (STEP, IGES, DXF).
- Utilize provided measurements and adjust dimensions to enhance strength.
- Prioritize strength and weight reduction in design.

Ideal Skills:
- Proficiency in CAD software
- Experience with aluminum milling
- Strong understanding of structural integrity and weight optimization

Please include any relevant experience in your bids.