These plans are for a forklift assembly to attach to your tractor. This is not a hydraulic lift. It's operated with a hand crank and pulleys.
The forklift plans call for a five bolt attachment method to the front of your garden tractor. This is so it can quickly be removed when not needed.
A lift will add to the usefulness of any garden tractor. Instead of trying to pick up those heavy items, put the lift on and get them into the back of your truck or trailer with ease.