Build your Gift Box website

Existing webpage https://actionpromote.co.uk/bespoke-branded-gift-packs/ . We are planning to sell gift packs branded with the customers logo. The existing e-commerce functionality has been altered to work with the enquiry basket. We want a webpage (perhaps a separate website if needed) that has the option for users to pick and load a range of around 100 products into a basket for their branded gift packs.
I would like to see a clear quantity box at the top where the customer can set how many they will need and change it any time during the sale so it alters the displayed unit pricing and total.

1. Customer Enters Quantity
2. Customer has the option of choosing from a range of 5 ‘pre-built’ packs or building their own pack from a range of 50/100 products
3. Build your own pack page
a. Quantity pulls through from previous page
b. Upload logo option and choose CMYK or 1 colour branding
c. Choose the box type, solid wall or corrugated, label or fully printed
d. Customer Chooses Products (this would be split into product sections or indexed somehow; notebooks, pens water bottles etc etc). These products would need loading to the site along with individual pricing. As the quantity changes the pricing will vary. Initially products would only have 1 image however in the future we may want to add multiple colour options against each item. The ‘choose your products’ page would display a unit price against each product that changes if the quantity at the top of the basket is changed. There would be a ‘sticky’ basket on the right hand side of the page that would scroll with the user as they select their products.
4. Customer Proceeds to checkout and fills in details
- Name
- Email
- Address
- Deadline
- Etc (as this is a simple form I’m assuming we can use it to capture any other details needed such as a logo upload?)
5. Order sent but not paid. Will come through as an email to the Promote team outlining all the above