customer multi image upload for opencart

Require ability for customer to upload multiple picture files. These to then be shown in specific positions on page. Each product page would have only one possible layout. I have attached 4 initial layouts as examples. We would want the line drawing to be visible on the page. Customer to then be able to select which section they are uploading. The uploaded file to then be placed in the correct section. Each section to be selectable for upload and for confirmation/replacement before customer completes order. Ability for us to be able to know which file is associated with the specific order and section would obviously be essential. This could be simply by notation or by composite picture . . .as long as we can know what they want where! The opencart based website is just being finished, but the company doing it do not have the technical expertise for this. We need this asap and are open to sensible prices to achieve. Many thanks Steve