Here is the layout for the throat, mouth, bed, abutments, and cheeks for my plane.
I referenced two books: Wooden Planes and How to Make Them, by David G. Perch and Robert S. Lee; and Making Traditional Wooden Planes, by John M. Whelan.
The two books are slightly different in their approach and presentation, and I made some slight revisions to suit my plane—so don't take my layout as gospel. If you can get ahold of some old wooden planes for reference, it would be helpful to you.
The pencil marks in the photos are pretty light, so I included two images (at right) with clearer layout lines and angles.
I also added images of the little coffin smoother (last image) that I made awhile ago so you can see the physical shape of the throat and abutment.
The lines on the blank that are at the very front and back represent cutoff lines (for the final length).