Customer Data for before Check-Out

Hey, we are buidling a new web-store based on the latest version of opencart. As we are doing customized fashion, we would like to ad the two things: 1) before Check-Out, customers should enter size data over several steps - example: ([login to view URL]) @indochino, just customize a suit and then go to check out, the process from there is basically what we need. The returning customers should have this data have saved in their customer profile and should be applied automaticall, or he can choose to update the data. 2) the product options page of opencart should be split into single steps, e.g. with a jquery page, and slide (just as indochino is doing it). There we would just need a sufficient jquery product page template. We are in a hurry! We expect minor changes in the customer backend (additional database fields) and two jquery page tempaltes for the additional process before checkt out as well as the product page itself. The design within the jquery and the final steps we can define by ourselves. What is essential, that the additional process steps integrates seamless into the opencart process.