[JudokaJohn]

Here's a yellow GT with rust bubbling under the paint. Other than that, it looks good.
1971 Opel GT - cars & trucks - by owner - vehicle automotive sale

 

[JudokaJohn]

It actually has some nice mods. Vintage air AC and power windows, to name a few. Sort out the rust and you could have a really nice GT.
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You are correct. However, I would be scared, because it may be a LOT of rust under there. One might think- "Oh, a little rust spot here, and one there". But once you get into it, you don't know how deep it goes.