Hello!
I am your guy for this, hands down! I work with startups and my recent clients were just like you, entrepreneurs who left the corporate world.
I can not only do the aesthetic design but also provide electronics development, Engineering drawings for manufacture and also sourcing services for parts.
I have currently quoted you your minimum offer, but I would like to discuss with you exactly what you need, a Skype call or a phone call perhaps?
This project is fully in my expertise area, I am an Industrial Designer graduated from IED Milan, and I work with companies such as 3M, BMW & more. I have a small studio for 8 years now!
I have a small portfolio in my profile - I think you can view it easily.
Oh yeah, and I forgot to mention, I will not give you concepts in sketches - I will make 3D mockup models for all concept ideas so you can view it in 3D space to get a full understanding of where we are headed - something most designers don't offer. We also use LEGAL CAD/CAM licenses for all our work, Autodesk Fusion 360, and this will enable us to share with you a link of the work in progress that you can track from your phone or computer browser :)
Alright, I think that was my pitch! Hope we can have a dialogue to further this opportunity.
Best,
Hannan