Develop extensions for an Online store

My client needs solution for his Bathroom Sanitary ware business. i am building the site with Joomla & using Hikashop as e-commerce solution. Extension 1 Scenario and functionality needed: >> Wall and Floor Tiles: Ø An image of bathroom wall is displayed Ø Client provides wall size in Feet & inches, for example 16 feet Length and 12 Feet Height Ø Client first select the tile size, for example 2 feet x 2 feet Ø The extension automatically calculates the number of tiles required and their total price as per the tile selected Ø If the client want to select different tiles for any row (like bottom, top, middle, alternate row, etc.), he may be able to select them and now the number of tiles required for row are calculated, displayed and total price is displayed Ø If the client want to select different tiles for any column (like first, last, middle, alternate column, etc.), he may be able to select them and now the number of tiles required for column are calculated, displayed and total price is displayed Ø All the selected tiles are displayed in image like a virtual wall Extension 2 Scenario and functionality needed: >> Bathroom Fittings Ø An image of bathroom wall with multiple fittings are displayed Ø At admin end, we can add, edit or remove fittings display placeholder having a bathroom wall as background Ø At user end, suppose a user want to select shower Ø He then chooses his preferred shower product Ø Now the selected shower product is displayed in the Shower Place holder of the virtual wall Ø Same for wash basin, taps, etc.