Hello,
A floor restoration on a badly rust damaged W113 can take a professional shop 100 hours or more depending on the amount of fabrication and/or the pre-made panel used.
Having the right equipment and the car set up so it can be worked on easily will save time and improve quality. If you are not equipped or experienced the work will take a lot longer. If you are working on your back expect to spend a lot more time.
If you have a complete floor and chassis to rebuild, setting the car on its side with a fixture is well worth the effort in the long run. You will save an enormous amount of time and discomfort and the quality of the repairs will be better in most cases.
However I understand that this is beyond the capabilities of most owners.
If I am not setting the car on its side, I prefer to lift it from one side at a time. In this way not all the welding is done on your back!
Download Attachment: floor work2.JPG62.51 KB
Pre-made panels (K&K Manufacturing) save a lot of time and improve quality over making them yourself. In addition these panels are zinc coated to resist corrosion.
Joe Alexander
Blacklick, Ohio