My first attempt was with a blank that measured about 1.5" thick by 3" wide. This is about the dimensions I had planned on. The final length I expect will be about 12''.
I used my router and stop blocks to gradually rout a groove in face of the wood leaving 1.5" at each end. The groove finally got to be 1.25" deep, which was plenty good for house keys but about 1/4" short for car keys. (By the time I get this finished, car keys may be extinct
My next attempt will be to try Roy's suggestion, or go with my thought of cutting the two end pieces and gluing them back on.
As for hanging, I will try both holes drilled through, or keyhole slots on the back.
An interesting aside, is that the wood I'm using to practice is a 2 x8 plank I got from my uncle's place about 25 years ago. It has been in my unheated garage since then. I don't know how long he had it. When I cut into it to make the blanks, I was amazed that the pine smell was still very strong and the pitch was still fresh.
More to come, I just don't know when.
John