This should be glued and fixed with the appropriate fixings fix your outer main upright for the other corner of the cupboard from floor to ceiling.
How to build a door frame under stairs.
The board that transverses the top of the studs is called the top plate.
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If your woodworking skills are good cut mitres at the top corners.
Run a batten the under stair batten along the underside of the stair case from the position of the outer main upright down the outer edge of the underside of the stairs to the floor.
The other is to build triangular walls that fit underneath the stair stringers and enclose only the area beneath the stairs.
I used 90x20mm timber for the frame.
Using a protractor note the angle at the top of the door frame.
To make the door header cut 2x4s to the width of the original opening.
Later on all holes will be closed with hard wood plugs.
One way is to build full size walls adjacent to the stairway that enclose the areas on top of the stairs and beneath the stairs at the same time.
To make the studs measure the height of the door to be installed.
Measure the width and height on both sides of the door frame.
Cut 2x4s to the height of the door plus 1 1 2 inches 5 1 cm to allow room for the top of the frame and allowance for leveling the jamb.
Using one of the door panels as a guide cut 25 x 40mm 1 x 1 1 2in timber to form an internal framework for a door 50mm 2in thick.
Run the strips for the two long edges first and cut the cross pieces to meet these.
Look through under stairs doors pictures in different colors and styles and.
There are two ways to frame in the area underneath a stairway.
Step 2 subtract 5 16 inch from the door frame s height.