Hello there,
As a quick aside, I recently reversed engineered one of my favorite Bluetooth speakers. For manufacturing, I chose to 3D print the shield casing.
Well, I gave that background to demonstrate my knowledge in design as it relates to making a speaker.
What you have described can be done by me in a day timeframe.
Engineering drawing from the basic sketch-NO problem!
Modeling Product-No Problem.
Re-designing if necessary- No problem.
Rendering Suitable File Output- No problem.
Basically, I can get the job done for you ASAP. Availability- Ready to begin straight away.
Regards, Mechanical Design Engineer.