Create a website minimalist modern for electric bike

we have a customer, they want a website for their product is a electric bike, they have all image your the website.
they need:
the website in shopify.
shopping cart with a payment gateway
Unique website design not a template
modern and minimalist website.
the time to deliver this website is 15 days
they have this website https://echelonfit.com/
they want something better and modern.
they want to register clients for future email campaigns.
They need the website optimized and fast that passes the google standards
https://developers.google.com/speed/pagespeed/insights/
The design has to be responsive to the website and friendly for the user.
Can buy by registering or without registration