-You may NOT re-release or modify any of the models/textures under your own name whatsoever, unless you get the permission of the individual author.
-The Sandbowl, Shrine, and TNT Wiring is allowed to be modified however, with original credit given to "fantasmos".
-You may NOT take absolute credit for the map, you can only take credit for changes you have made.
-You may NOT re-release it under the name Sandstone, you must rename it (e.g sandstorm, sandtrap)
-You must name the map a derivative of sandstone in your map thread's main post
If you are unsure of anything, msg me on steam, my username is "fantasmos" and same for tf2maps.net