@Dimitry
Let's assume stems of 20 centimeters diameter (2/3 Foot). So we need about 2438 stems for the pallisade, plus about 2 per 10 meters to nail them to and another time so many as bracing. All in all that's about 2553 pieces of wood. Cutting down a 20 cm tree with axe and saw takes a single worker a guesstimated half an hour. So about 1276.7 manhours for logging alone.
that's 255.3 hours of logging with 5 men. These trees are not debranched yet, so let's guesstimate they need roughly double the time, so a total of 2500 manhours (=500 hours for 5 menb). Assuming they work 12 (daylight) …