Comparing price field - mod opencart

Comparing price-mod opencart 1. add an extra field in admin>catalog>products>data view as shown in backend [login to view URL] 2. use this field instead of Product price field (as it is now) to calculate figures marked in green in frontend [login to view URL] 3. use this field to show figures marked in blue in frontend [login to view URL] -Don´t miss that figures are depending on packing field: admin>catalog>products>data>Packing. I assume you can´t miss that when you read the code. -Don´t miss that frontend figures are depending on product tax field. All shown prices should be including tax, (just like now, except with a minor change -the small figures under red price in cart blue marked "A" is now "quick-fixed" hardcoded with the tax class, please change to including tax without hardcoding. Two decimals instead of one as now.)