Extruding diagonal rectangle from interior corner I am trying to model a small wooden crate like in this image.



I am having trouble creating the diagonally extruded boards as I am trying to avoid adding new primitives and combining them later. I have gotten this far in the process. 



Can someone explain how to extrude the circled red corner and merge the extruded end to the other corner.

Thanks :)
Make 4 Loop Cuts (Crtl+R) at where it should intersect.





Select the 3 vertices IN THAT ORDER then press J to make a diagonal a line.





Repeat step 2, but with opposite vertices, to create both diagonal lines.





Select all 4 corners of the rectangle we have created.





Press E and then whatever axis they are facing, then bring them out until they are flush with the outside rim of the box.





Go into Edge Select Mode, then select these two edges, press X, then click Delete Edges .





Select all the points and press F and then press Ctrl+N, to Recalculate Normals.





DONE.


Let me know if thats not what you meant or if I messed up on a step!