Hi pccoughlin:
Please tell us a bit more about the lintel, such as ...
- span of the lintel
- depth of the lintel
- loading on the lintel
- spacing of the stirrups
- ....
Boy, #4 stirrups ... that must have been pretty tough to work with, #4 rebar for stirrups seems to be too much -- anyway not knowing all the details, this is just thinking aloud.
Great job on posting good clear pictures.