Forest products processing plant refers to any mechanical set-up, device, machine or combination of machines used for the conversion of logs and other forest raw materials into lumber, veneer, plywood, fiber board, block board, paper board, pulp, paper, or other finished wood and other forest products, excluding the construction of buildings and other architectural and structural components. (Sec. 4(f), Prof. Regulatory Board for Foresters Resolution No. 001-16)