Shopify Website Customizations (Ypsilanti, MI)

I have a client who is in need of several improvements with design, function and speed done to their website, amishtables.com:

- The major issue is with site speed: recent stats 12/100 on Mobile 50/100 on Desktop we need to be 90+ for both - not sure what is feasible as they are running some apps that can't be removed.

- AMP Certified / Mobile Upgrade

- They would like this page redone: https://www.amishtables.com/pages/stain-sample-builder - this was custom created ordering system, but they think it is confusing and would like it more streamlined

- They want the cart updated and don't like how it looks on mobile devices

- Some issues with popup screens not having the ability to close them

- May need help with page design updates

This is just a smattering but there will probably be more. I am estimating that this is about a 30-50 ish hour project, depending on what needs to be done to improve speed.