How to create a product queue for a monthly subscription service?

[shrakal]

Hi Everyone, 

I'm trying to create a "product queue" for a monthly subscription service.The user can add a product to each monthly slot in his queue, only allowing one product per month.The system creates a new order each month with the selected product.The order is automatically created on a specific day in the month.Product selection can be changed, deleted or suffled between month slots.My idea is to create an "product_queue" table where all the selected product_id's are stored by queue_month and user_id. Thinking of an app to handle this part then using existing susbcription apps to handle the subscription part. Anyone has dealt with this requirement. Your thoughts and suggestions are appreciated.

Thanks