We spent most of the day cutting out rust:
Here is the rear cab support:
Most of the support was still solid, so we decided to only replace the flange on the back of the support. After a lot of cutting, grinding, fitting and welding:
Here is Geoff getting the cab ready for the inner rocker:
...and the inner rocker is tacked in place:
We ran in to some alignment issues with the inner rocker towards the end of the day, so we wrapped things up and decided to tackle it another time.