I have a whole playthrough of the first several areas, including this whole section:
This requires making it onto your boat and to the saw mill.
1. Run up the ramp and try to push the level to retract the ramp. It will break.
2. Push the dolly cart to the right, underneath the overhead wood on the far right.
3. Use the level on the upper platform to line the log up so that the middle lines up with the saw.
4. Use the saw, cutting the wood in half, dropping half onto the dolly.
5. Pull the cart to the far left. Use it to jump up to the second floor of the building.
6. Grab the box here. This is a repair tool! Keep it for the boat.
7. Walk up to the broken lever, and it will automatically fix it.
8. Use the lever to progress.