I enjoy creating parts from scratch using Aluminum turned on my lathe. Although I am not of Pete Johnson caliber, it is really cool to say. I made those pulleys for my engine, as opposed to I bought those pulleys from a guy over there.
I put the Oil pan on according to the destructions, and it is exactly built the way the instructions are pictured coincidentally. Even if the pan were on backwards it wouldn't change anything because the Mounts, and frame brackets only allow the engine to set at one Heigth anyhow, whichever way the OP is put on.