If you plan to make this for the interior it will be too thick to fit the existing jamb and you will have to modify your plan for accents.
Making a door double hinged.
Use a square to make sure the corners are right angles.
After making mortises on the door for all three hinges grab the 1x4 or 1x6 that will be the side of the frame that the hinges are attached to.
How to make a hinged door from plywood.
Screw the hinges into the door.
Plywood makes a durable door for a shed storage building or utility locker.
Mark the placement of all hinges making sure to factor in the 1 8 gap that will be between the door and top of the door frame.
Then repeat the process with the bottom hinge.
A sheet of 3 4 inch exterior grade plywood cut to size and fitted with t strap.
Thicker wood will make the door better at keeping heat in but will also make it heavier.
Make sure that the screws are tight and the door feels secured to the shed s door frame.
Be sure that the door you make is the proper thickness for your door jamb.
While your friend continues to the hold the door in place use a screwdriver to drive 1 5 inches 3 8 cm lag screws through the holes in the top hinge and into the door.
Building the double door is a straight forward job especially if you use the right plans and carpentry techniques.
In order to build the doors we recommend you to use the piece of siding cut out to make the opening.