Thanks man, yes exactly. That's why decided to poke around known bad areas, wire wheel where the undercoating is obviously failed/crunchy and leave the rest alone. There is no way in hell I can do a better job than the factory so would like to save as much as possible of the OEM stuff.
I had was a lonely B-day thanks to lockdown, but the boys got me a nice complete e30 trunk tool kit, which they noticed was missing in every one of my e30s. Not only did they go through the trouble of hunting every piece down, but they also polished them as good as they could.
That warmed my heart, really! Here's what it looks like.

Now, onto the main character in this thread. The lip at the back side of the floor was looking too pitted and thin to be left alone.

Decided to repair it as it is a simple shape, which was quick to make.

And also quick and easy to weld in

Ground down as flush as I dared
[img]https://i.imgur.com/FEpM9wt.jpg?1[/img]
Back side wasn't too bad, so took down the most protruding welds and edges.

Started taking off the undercoating from the front half of the floor and took a closer look at the big tin cap of the rear section, which was used to drain the paint on the production line. Didn't look that bad from the underside, coat peeled off the protruding parts of the cap, but they were solid despite some surface rust.

A quick poke with a screwdriver from the cabin's side revealed a different truth.

Off with the cap and the sealer, forgot to take pictures of the rot, but here's one of the already repaired drain hole.

And from the bottom side.

Quite happy with how it turned out. Got an OEM replacement for the cap too, it was surprisingly cheap at 8 euro.
Now is the time for some facepalming. in the previous post, I showed how I managed to repair the mounting points for the brake and fuel lines and was very proud of myself.
Weeeell, now I tore them off.
Because I remembered (yes, had forgotten) I want to put in a modern day ABS system in the car, from an e46. Which requires an additional brake line, as this ABS uses one for each wheel, not like the original one in the e30, that uses one line for both rear wheels.
Having realized how I wasted time, made the quick executive decision to act immediately and replace the original threaded mounts with the required studs in the correct location for the e46 mounting hardware.
Onto pics.
An overview of what I had previously made with the mounting hardware I wanted to attach. Note there isn't enough space to attach the hanger to the original thread.

Out with the grinder and welder and soon enough

Cabin side

Furthest back mounting position

Cabin side view

I did these in big patches, because I saved the original ones in case they are needed for another e30 in the future. Currently doing welding repairs on TWO of my mates' e30s and another one is in the waiting list. I guess people like how I mend e30s.
And how the mounting pieces for the lines attach to the floor. Very pleased with the result.

Did two more up front, but only have the view from the cabin for some reason.

So, with this sorted out and the majority of undercoating gone, started to fit the floor to the car. Unfortunately, it has twisted from all this moving around and flipping over and of course from all the welding. This made things quite difficult, but managed to have it fitted. Started cleaning up for the welds when I found more rust on the car, where the bracket for the heat shield is attached. Exactly the same as the passenger side, so should have seen it coming. Naturally, this halted my enthusiasm and took a brake from this.
Something not welding related - I've always loved the look of the police cruisers' steelies and caps in the US. Since the plan for this car to be on steelies, this was the perfect opportunity to mimic that look. Spent about a month looking at caps from many makes - LADA, Trabant/Wartburg, Moskvich, Opel, Mercedes, FIAT, etc. Then I remembered, there used to be a steel cap offered for e28s. Luckily found a set in Germany for a very good price (they are not mint, but in really good condition).
On the e28, they are offered with a specific 14 inch wheel, which worried me - could that mean they wouldn't work with another wheel, say 15 or 16 inch? My desire is to run 15s with meaty tires, so was hoping for the best. From what I could tell in the pictures, they use the wheel bolts to attach, not the wheel itself. So a deal was made and just before New Year's Eve I got these.

One of my mates' e30s is sitting on 15 steelies from an e34 (5 lugged already) and was begging me to test fit them

They mount solid, but are not flush with the wheel, about 2mm apart. A small rubber strip will fix that.
Needless to say - I love how they look!
Let's finish this post off with some other news.
Just before Christmas, a friend sent me an ad about a car he knew would interest me. So naturally, I had to go and buy it.
Here it is, it's a fully operational, running and driving (and donuting and drifting and burnouting) donor car, it's only on the trailer because it's unregistered.

What made me buy it was this lump

It is NOT for the car being repaired in this thread though, just wanted to share.








































































































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