Making Graphical Mods is structured a bit differently than making mods directly for AoE2, both AoC & HD, but the general idea is the same. If you have never made graphic mods before, I recommend checking out Ozhara's Modding Guide. http://gtm.steamproxy.vip/sharedfiles/filedetails/?id=190070326

The first thing you need to know is that the SLP files needs to be directed into the "slp" folder ("resources / _common / slp") and NOT the "drs / gamedata_x2" folders. While they can be added to the "gamedata_x2" like normal, since I have made the "SLP Name" the same as the Unique SLP ID Numbers, The HD Workshop has conflicts using that method, which is why the mod uses the SLP Names instead. Otherwise, it is no different from making a normal graphic mod.

I have provided a SLP list in a text file in the workshop folder, which can be found at:
Steam / steamapps / workshop / content / 221380 / 1821860772
Or can also be open in the in-game workshop menu.

This does not list the original graphic SLP's, such as the original AoC Buildings and the Mediterranean Buildings. I will add to the list with the original SLP numbers as well, but for now, I recommend a method of using a popular AoE2 tool, such as AGE editor or Turtle Pack & using the SLP list as a cross-reference.