Replacing Cab Floor - 72

[cedorris]

I started the major metal work today on my 72 and discovered it has a lot more rust than anticipated.

Both of the front cab supports are destroyed and the cab floor is rusted through in places that are not part of the new patch panels or rockers.

Many places sell entire cab floor replacements for around $500 that would eliminate the rust spots I currently have. These cab floors also include the front and rear cab supports.

I have a few questions:
Has anyone ever used these replacement floors?

Would it be better for me to try and purchase a new cab rather than try and fix my existing cab? My cab does have factory air.

Is it possible to remove the existing cab floor without complete removing the cab from the frame and unbolting the firewall?