thanks for all the idees, i'll try to go with a charcoal based set up first. i made two turtles one to cut the trees automaticly (and replant) and one to sort them out. but i have hard time putting programs in them (so they will be automaticly available to all my turtles, and so i can write them out of the game). the issue is that the mod is zipped and not in a normal directory (and when i try to move it out of the zip, my save has hard time to recognize it :S) any experiences with this issue?