I found one of my first turtle scripts when I was looking through one of my old worlds. It's somewhat barebones in the sense that all it does is chop down and replant the tree (it won't even dump the items into a chest or grab fuel when it needs to), but it has the ability to use a GPS system to help it chop down the tree. If you decide to help it and get in its way or something, it will check to see if it is at the proper height instead of glitching out and trying to replant the tree in midair. This script does not require you to have a GPS system at your base, but not having one will make it glitch out if something gets in its way.

Anyways, to use it you just need to grow a 2x2 tree, then place the turtle so that it has a block of air in front of it, followed by the left two blocks of a tree, and the script will do the rest!

To install the script, run "pastebin get uPpUtvxE logger"

Feedback and suggestions are appreciated, and I'll try to help you out if you have any problems