Custom MP3 Player Housing Design

I need a custom housing for a consumer MP3 player. The housing will be made from plastic with a matte finish. I can provide the device in question. Needs connections shortened and put into thin rectangular housing about flash rive sized. Also request that accompanying corded earbuds be shortened as well. Buttons must be usable without looking at the device.

Key Requirements:
- Custom buttons
- Space for a strap to pass through
- housing as small as possible

Ideal Skills and Experience:
- Experience with custom plastic housing design
- Proficiency in creating functional and aesthetic button layouts
- Ability to alter existing electronics
- Ability to incorporate strap pass-through into design

Looking forward to your bids!