Textures HAVE NOT been copied. The author uses textures made by someone else, which happens all the time, and states it in the readme. BTW, textures are NOT from 'Scrap Metal II' by Bal, they're from 'Let's Drink Beer and Shoot Things' by Lunaran, http://lvlworld.com/review.php?id=423
and Bal used them for Scrap Metal II. Same set of textures has been used for other maps reviewed on this site.
I really hate it when people keep posting and posting comments just for the sake of posting something.