Hi there, a long long time ago I have posted to this thread but this was nearly 4 years ago. This is a childhood world that I have been able to dig up and it's been corrupted for several years. The main issue is that there are a lot of chunk errors, sign errors, generation errors, and "tree" errors. I have done everything in my knowledge to try and restore the broken chunks with the builds that I had.
Any help would be appreciated and I will not hesitate to provide more information if needed!