What is the best way to install a veneered door set

The diagram below shows the basic requirements to install a door set. Ideally you should put in a subframe made of 30mm softwood screwed securely to the brickwork. In a new build this enables you to make an accurate opening and be able to plaster up to it. Then you will be able to install these door sets at the last minute after all decoration has been completed. As the diagram shows you should allow 50mm on the width and 30mm on the height (from the finished flooring height). So if the door is 762mm, the opening is 762+50mm =812mm. With this subframe in place it allows you to fix the veneered frame in place ideally using corrugated staples every 150mm using a high powered staple gun. These will be hidden once the architrave is on. Also on the hinge side of the frame replace a hinge screw with 1 long screw in each of the four hinges. You can also put in longer screws through the striking plate. This method of fixing will leave the frame without any noticable fixing marks.