woocommerce print shop plugin

Hey, guys, I am having a difficult time here. We run a print shop and we need a plugin that will allow the customer to input dimensions of artwork, charged by the sqft. upload the artwork and be shown a preview. There can be no size limits they must be able to input any size.

Also if possible have the ability to design on site. (I found a few of these but they seem to be limited to set sizes and nothing bigger than 4’x4′. does anyone have any ideas?