Gas Installation & Fitting Job - Delmas, MP, 2210

We have an electric stove top installed on a Marble counter top above an electric stove. We want to replace the electric stove top with a gas stove top. Our current electric stove top measures 59cm in length and 50cm in width. I do not know what the height is. The pipeline for the gas will have to be taken through some cabinets and then through a double face brick wall to get to the location where we will want the gas bottle to be. We want the gas bottle to be outside the house. I estimate we will need approximately 5 meters of gas pipe. I don't mind looking for the stove top my self but I would like to have an installer tell me exactly which size to get to ensure a fit in the current opening we have int he marble counter top. I would like to get a quotation on the installation of such a device to ensure compliance with the law.