Rusty Rear

Hi folks,

I'm looking for some advice regarding rust in the back of my Jimny. I took a wire brush to some rust in the boot and was disappointed when it went right through. I then stripped out the back seats and found more rust, particularly where the rear seatbelts bolt into the floor. There were two small patches on the section that slopes down to the front seat. I have attached photos of all three areas.

My idea is to turn it into a two-seater and have a new rear floor welded in, with patches covering the smaller areas of rust on the sloping section (not sure of the technical word). But I have absolutely no experience of this and so have a few questions:

1) What are the advantages of replacement floors vs sheet metal?
2) What thickness of steel is required?
3) Roughly how much would this cost?
4) Apart from being attached to the rest of the body, is the floor attached to anything else under the car?

I would also appreciate any general advice on this topic.

Many thanks!

Making a new floor is a lot more work than using a repair panel, but materials cost is much lower.

Have a look at the floor in the front as well. If its like that at the back then around the pedals and equivalent passenger area will be the same

Thank you both very much!