Happy 1000 posts to me! Here's an in-depth look at the mod's intro cutscenes. The mod itself is also slowly chugging along, with multiple levels finished. I could possibly post a short demo soon if anybody would be interested.
You are missing all of the required sprites. You can copy sprites over from player.dta as placeholders. Also, you're using a PK3, and that means your S_SKIN and player sprites need to go into a Skins folder.
That's not it at all. With all due respect I don't think you understand what's going on here. The remake's MB page itself explains what the issue is.
May I ask why you are loading the multiplayer version and not the singleplayer version?