I agree it is a very well made theme as well as the bowtie simple one theme. This is a modification of SimpleOne so no I am afraid it can't be released he never gives permission. the trash is easy to make though it's just a small colored circle 1 white 1 blue for the trash for Dragthing , the tab is incorporated into desktop picture.
Afraid I don't know of any. I learned by messing it up and reinstalling it many times. What most people do (and easiest) is drag an app into the dock then right click it drag your custom icon into the icon well. On the dock select dock options , select the visibility tab and move the background translucency slider over to 100 %. Go make a wallpaper with any style dock you like ... easy peasy.