To brace or not to brace

[72tutone]

I have read several you should and is not needed posts in regards to welding the cab together when doing rocker panel/cab supports etc.
What seems to be the definitive answer? My cab is on the frame, and is not coming off, which leads me to my next question.
I need to replace the following on both sides; both front and rear cab supports, the rocker panel outer, b pillar's and a pillars. In addition the cab mounts are shot.
I should start by putting the cab mounts on first? that whay the cab is shored up on where its going to ride for hopefully along time.
Next cab supports? and then inner to outer?