That looks like a busy Foc's'le.
Last winter's project for me was taking a crane off an old telephone pole truck and installing it on a barge. The welders made up a frame and covered it with 1/8" steel panels bolted. I ended up putting a raw water oil cooler in later because the oil got too hot. I removed a lot of unneeded hoses and the tank was much closer so I think I basically reduced the oil volume.
The engine is an air cooled Deutz. I ended up rotating the gear pump 180 degrees from the original truck install. So now the in was the out and vice versa. Factory said it was OK. I wanted to use push on fittings for the suction but owner wanted JIC. I think they create more heat.