A few simple custom Opencart modifications

We have an existing Opencart site and need a couple of quick custom modifications: 1. We need the customer number to be displayed on all invoices and order confirmations. 2. On several products, customers are able to add personalizable options to their product (name, color, etc...). This works fine. But we would like a random ID number generated for each custom product that is ordered and displayed in the invoice and order confirmation. MUST have experience with Opencart! This is urgent, will pick the first qualified bidder.