I decied today Im going to fix this so went to a sheet metal shop got me a pretty thick peace of tin the size was 20" by 17" did some measurements used the jig saw and BOOM looks just like new well kinda. I wasn't going for prefection I just wanted the hole not to be seen anymore. This is about the only real rust I could find on the car the rest is ok.

Before I started pic

AND AFTER

nothing personal, but you must have someone knowledgable about these cars look yours over...if the rust is that bad, you might be driving a car that you could get seriously hurt or worse in....

we'd hate to find out that the car cracked in half with you being in the middle............

i wouldn't spend a nickle more on that car until it's inspected....

sorry to such a downer.......

otherwise, nice repair

Now that you have a digital camera, can you take pics of under the battery in the engine bay. And ones of the long under the battery from outside, looking up in the passenger wheel well.
Just want you to be safe...

Nifty repair. How did you fasten it to the floor pan? Oh, time to pull that rear window and seal that leak!

Geoff

Its weird I have pulled the carpet up and thats the only part that rusted there some was rubber pads covering it which wasn't really helping it. So over the years more water and dirt was able to take over that spot. But everyting is else is super strong and still has orginal paint and no sign of rust even starting. Also Gint is coming on Sunday to check my porsche out.

Looks like you just put the new metal over the old?

You should treat the rusty parts with Por 15 or some other rust inhibitor.

Everything else has no rust but the battery tray and under the seat. Someone stuck some carpet to help controll the rust on the battery tray though. I havn't finish that little project yet so I will go buy some por 15 and stick it all over the area then weld it down into place or screw it down.

carpet does not control rust... it holds water, which make for more rust... directly below the battery tray is a suspension console, if that part gets rusty... the car becomes VERY DANGEROUS!!!

also, covering rust with another piece of metel does NOTHING...
the bad rust needs to be cut out, any other rust need to be converted (if it's solid still), use por15 or even just OSPHO(replaces metal ready, not POR-15 paint) hardware stores... metal welded back in place(or screwed if there is NO rust, but this is not as recommended...)

the parts we are worried about you WOULDN't see in a "normal" inspection, take the rocker panels off(they are attached with some screws under the car, easy to get off/on really) under that is the longitudinal support, since our cars don't have solid tops this piece is VERY important to the structure of the car.... either don't drive it until Gint gets there to give it a real inspection, or pop the rockers off and take lotsa pics for us to see, to make sure you aren't driving a car that's waiting to collapse...

Looks like you did a good job cutting it out. When you get to the point where you're ready to weld something in, new floor pans are relatively inexpensive. But your fab work on this looks nice.

In my opinion, if you are at all serious about your car and its value, you should wire-brush, sand, sandblast, scrape or otherwise CLEAN UP THAT WHOLE AREA, and thencoat that whole area with a good rust conversion material (I won't specify brands). Then Topcoat the entire area with some color paint.

Then if you still want to "cover up" that area with your metal plate (is that galvanized?), go ahead and cover it, but I would not recommend welding a piece of galvanized in there.

My advice is to clean it up and keep it dry. Once you clean it up, you may find that your "hole" isn't as big as your "repair" panel. I would repair what needs repairing bu cutting out rotten metal and replacing with new mild steel. If the area was large enough, I would consider a replacement floor section, but if it was a few smaller holes, I would form them myself to the original shape and weld them in. Then I would repaint the area and keep it dry.

What is going to happen when the floor rots away with a passenger sitting there? They may fall through.

I believe your "fix" is just "hiding" a big problem.

Just my $0.02