Create web form that communicates with hosted excel file (live .xlsx file hosted on server).
Write web form data into hosted .xlsx file and publish result to print friendly html.
The idea is to have a hosted excel file that performs live calculations in the back end and the publish the calculated result to the web without the end user knowing they are using an excel file.
Ideally the solution should not make use of Excel Web App unless fully secured.
Excel front end will be provided in HTML/CSS. Front end example attached and blocks indicated are those from where data must be read. Fully functional and final excel will be provided.