Скачать или смотреть Indy3D - Machine Strats

Here is the alteration of the backwards roll, when you holster your weapon while rolling backwards you are able to jump earlier. This is needed since the height of that pit is to small to get the normal roll+jump trick.

It is also possible in this level to skip the deactivation of the lightning rod before you get marduks head. You can either jump onto the pad below one of the crystals and fly up before getting killed.
After you put the flying artifact into the machine you can use the lift to get to the horse body. On the decent downwards you can jump into postion to place the head and skip climbing the ladder on one of the sides.