Its not that easy to find 2" PINE BOARDS.If you do find some they will most likely have a twist.
My idea is unconventional for sure
But here goes.
I will buy some 3/4" boards and glue 3 of them up into one bed rail.
I will leave the middle board long so it makes my tenon.
This will allow me to get the 2" thick rails that I want for the bed. After i plane 1/4" off the rail.
With all the new glues on the market today It should work and last a very long time
I will post asap.
The picture of the tenon is just a scale if scale. I will build the whole bed 1/4 scale and see what it looks like.