Build a Website - repost

Hi guys, I'm in the process of building a subscription based online store with WP/woocommerce. Using the Avada theme. At the moment we're looking for someone who can develop the following scenario: From the landing page I want my clients to make an account like it is done on www.graze.com. After they have entered their address and payment details they get access to a selection of 100 items. Here they will have the option to select 12 items from a total list of 100 that we will package and send to them on a monthly subscriptions base. The price of the subscription is always the same no matter how they configure their list of 20 items. (it needs to always add up to 12, if not a warning message should pop up) Items will not need an individual price tag. The package that a client has created will be automatically saved under 'my account' Every time a user logs in he/she can reconfigure their package. If they don't reconfigure, they can opt to receive last months package or a selection made by me. When they go to 'my account' they should be able to see their current selection and be able to alter it up to 3 days before shipment. In this scenario there should be no 'check out' or 'shopping cart' as there is with standard woo commerce online stores. Payment is done upon account creation at which a user agrees to all terms. I will use [login to view URL] as payment service provider. Some key elements for my website are: Account creation with address and payment details. Item basket based selected items with minimum of 12 items and a maximum of 12 items Membership pause option No checkout and no shopping cart Monthly packing lists from WP admin panel I hope it is more or less clear what I'm trying to achieve :-) Thanks in advance and looking forward to your input! Klaas