This was a post that was eaten by the recent forum software crash. I am not recreating the entire thing but to those who were following this discussion, here is what I finally ended up with:
The original post had a link to a home grown rabbet plane youtube video. My version has the following changes:
I needed some extra cutouts on the top side to accommodate my specific chisel.
A large open area was created immediately in front of the chisel cutting edge. The original version jammed up almost immediately and made it non workable.
Last but not least, a small recess was created on the bottom of the plane in front of the chisel cutting edge. It is not readily visible in this photo but if you look real hard you can see it in front of the chisel cutting edge. The idea is that the chisel cutting edge is even with the bottom of the plane so no material is removed if the plane is moved over a flat surface. The ridge left over after the surfacing operation fits into the small recess and the chisel can cut off the ridge without touching any surfaced area. It also limits the depth of cut of the chisel so a taller ridge requires multiple passes with the plane.
I hope that makes some sense ….
I am unable to do proper testing with this version as the ridges on my spoilboard had already been removed. I used the new version to clean up some uneven areas and it seemed to work quite well.