ashkan
May be I can guess... I suppose that because of simplicity of the model you can texture them by face using some tricks around random polygon selection. And to the point// What was said about Turbosmooth modifier, I thnk the author didn't use it. To my mind it was said about ProCutter parameters=> Advanced Options rollout=> Make Quadrilaterals checkbox which allows to generate quadrilateral topology for boolean resulting mesh.
И по русски) Turbosmooth там не было, имхо, это галка Make Quadrilaterals, которая генерирует квадроупольную топологию для результатов булевых операций в ProBooleans и ProCutter.
