750 frame

[groome]

Hi all,
Due to gravel on the road I came of my k3 750. Unfortunately it put a dent in the frame just under the fuel tank, so I've been looking to reframe it but I don't know if I can only use a 750 frame or if a 600 or 1000 frame is compatible without extensive modifications.
Cheers

 

[groome]

Here's a pic of the dent to the frame if I can get it to work lol

 

[citizenlambda]

From my (very limited) understanding, there are very few differences between the 600 and 750s throughout the generations, aside from the bore of the engine. Would be great to hear from more experienced members if that's wrong?