Transom Patterns
Two full size transom layouts are shown below. The first for the Bezier 28.
The Bezier 28 has a radius Transom. The vertical lines inside the perimeter of the transom represent 1/2 degree bend lines for break forming the radius.
Inscribed in the transom pattern is a template for the radius of the transom. Transfer this template to a scrap piece of plywood or hardboard and roll the transom to match the radius curve of this template.

Next is the flat transom for the Bezier 12.5. Note the notches and cutouts for the longitudinal's, center vertical Keel, and rudder pass thru. There are no bend lines since this transom is dead flat.

Preparations for 12.5 Transom Installation
Before the transom can be install the longitudinal framing must be fabricated to extend beyond the last transverse frame and the transom itself. These locations and lengths have already been determined for you when the longitudinal's were either "saw cut" or "rolled formed" to shape using the templates supplied with the plans.
Fitting the 12.5 Transom to the Framing
The transom angle will be established by using a temporary extension plate attached to the Center Vertical Keel. This extension will establish the angle and center location of the transom to the rest of the hull framework.
Aiding the fit-up of the transom are the notches in the transom itself. These notches locate the longitudinal's, while the witness marks on the longitudinal's locates the transom.
It really could not be easier and more accurate.