Invoice Template Generator for different templates and different page size

Hi all My project is regarding about creating invoice template for custom templates of our users . To clarify, A user has own his paper invoice. He uploads his invoice to my site and drags some fields, which are generated by our site such as customer name,VAT number, item name,item unit price etc., into preview invoice section that is uploaded. After dragging all required fileds , the script should give me the template source code. Script must use external script like [login to view URL] Sample Process First, user can select paper size and type(a4 vertical, a4 horizontal with 3 columns,a4 horizontal one column,a5) 1-User uploads his template as png 2-Drags and drops some fields(customer name,customer address,vat,subtotal,grandtotal ..) that he selects into the exact section of preview of his invoice 3- User add or remove any fileds he wants. 4- After locating the fields he has selected, He saves the template. When he saves the template, Script should give me the exact positions of fields,width and height of the fields and paper type. It requires intense js knowledge and make sure that you are capable of doing it. Because position of each field is important, Script should give the best results for each paper size and type. So positioning is as crucial as script runs smootly Code should be readable and the coder should create simple user manual page You can ask me whatever you want related to the project