So I'm fitting a 3 point belt to my T25. All pretty straightforward.
So I saw this rust in the r&r bed area (bottom left of pic I the corner). Thought I'd give it a sand back and paint

This happened.....

Same happened here.....

After this I decided to take out the windscreen and fit a new rubber seal....

However..... Found this ( after a bit of sanding).....



Not great. Was hoping for some light bubbling!!!!
Also had a go at the footwells and front seat area (subjected to water due to the above!)
Came up ok, however some small tiny corrosion hole and a large circular hole that is meant to be there.
Should there be some sort of plug or grommet there?

Also noticed a some corrosion on the roof area, after a quick sanding, this happened.....

I'd like some advice please. What should I do?
Is a good welder the way forward? Any more advise greatly appreciated.
Will post pics of the seatbelt fitting and the interior carpet lining as I do it.
Cheers
Cheers!!!!