My Home-made Prie Dieu (Kneeler) Plans
The kneeler pillow board itself is 9" by 20" with a 2" thick foam piece I then covered with a rugged fabric material. I used a staple gun to staple the fabric material around the foam to the underside of the kneeler, kind of like re-upholstering a chair.
The top piece where you place your arms (along with a bible or prayer book or rosary) is 24" by 10". So it's oversized and is glued onto the top piece of pine. I used a different type of wood, I had some nice pieces of cedar/redwood, but you could skip this step and leave the top piece as the pine board 9" by 20". It will glue flush between the side vertical pieces. This is the top piece that connects the two vertical side boards.
To give the slant to the top of the kneeler, make the vertical side piece 32 " long on one side and 30 inches on the other. Then when you cut them, the slant will be made. I dont know if this makes any sense. I kinda was flying by the seat of my pants when I made this.
The two little feet pieces that glue to the inside of the kneeler are 17" long and 3 3/4" wide. They stabilize the kneeler and give you a surface to place the actual knee board on. I used another piece of pine 18 3/8" by 3 3/4" to glue between the pine footers to further stabilize the feet and support the kneel board. Especially if you're a heavy pray-er.(LOL)
I used cheap pipe clamps and furniture clamps and titebond glue to put it together. The hardest part was getting the initial glue joint set up for the top piece and the side vertical pieces. As Mr. Sweat used to say in shop class in 7th grade: " measure twice, and cut once" and always do a dry run of clamping before you actually apply glue and clamp.
I cut some little notches out of the sides of the vertical supports to give it a bit of character but if you are good with a roto zip you could probably do all sorts of cool things on these side pieces.
I attached the actual kneeler pillow board to the kneeler with velcro .
Note, I am 6'2 and you may need to shorten the vertical dimensions for the kneeler a bit if you are quite a bit shorter.