Changes to Joomla / Virtumart Sites

Hi, We have 2 Joomla / Virtuemart sites that use the custom size calculator module to work out the price of the product. We need some changes to both sites :- 1. On the glass site, if "shaped glass" or "clipped corners" are selected it should add £5.50 to the price of plain glass 2. On the bricks site, if "shaped bricks" are selected it should add £5.50 to the price of square / rectangular bricks 3. On the glass site there should be an option on the calculator for 5mm thick glass, this can be a simple checkbox and it should add 20% to the value of the glass. The standard glass we provide is 4mm thick and so a simple checkbox for 5mm would be best or alternatively a pull down menu or radio buttons depending on which is easiest to implement 4. On the bricks site there should be an option on the calculator for 30mm thick bricks, this can be a simple checkbox and it should add 20% to the value of the bricks. The standard bricks we provide is 25mm thick and so a simple checkbox for 30mm would be best or alternatively a pull down menu or radio buttons depending on which is easiest to implement Thanks