:arrow: This has also been posted on the General Forum :!:
It's a simple construction. T&G boards are usually 12-18mm. Run a rebate up both stiles to suit the boards you have. Also run a rebate along the top rail. The middle and bottom rails should be wide and thinner, so that they will sit flush with the rebate, and the boards can lie on top.
Tennon the top rail, with a hanch. Tennon the middle rail with a double tennon and a haunch in the middle. Tennon the bottom rail, with a double tennon, middle haunch and an end haunch. All tennons should be glued and wedged.
The braces should be the same thickness as the middle and bottom rails. I tend to fix these in using corrugated fastners and glue.
Secret Nail the T&G boards, paint or stain, or whatever finish your hoping for...... just on the tongues and grooves, this means if the boards decide to shrink a little, the gaps don't become unsightly.
Also if your using T&G boards with the V groove, run your router around the door stiles and head, and around the edges of the ends and top of the boards.
I hope all that helps,
Simon.