We have just finished putting a 4' x 8' pattern together. From the information given, the time required is wildly optimistic - it took us about 4 hours of work. Part of this is due to the somewhat cumbersome process of removing plastic which is strongly attached to all the parts (~ 1 hr of labor). After that, the assembly process went smoothly. All parts were present and a tool provided which was helpful (it appeared to be a metric wrench). Once assembled, the unit is attractive and functional. Overall very pleased, but do set aside half a day for that assembly.