This is going to be quite a vague question because I don't have any specifics yet, but was just wondering if you can add an extra step into the core commerce ordering system.

The reason for asking is we are exploring the possibility of offering a web2print service, where clients can order POS, fliers, direct mail items we design, but the extra step would allow them to customise the artwork.

I know C5 cant handle the web2print system directly, but could core commerce send the user to a web2print service once they have picked a design and added it to the cart, and then once they have customised it return to C5 cart to complete the order?