Yes, that’s a perfectly viable and common method for end-machining long items.
The problem with bio-metal is not the milling and drilling.
The problem is cleaning all the powdery swarf out afterwards! It is not good for the machine.
Though I have seen worse: a Bridgeport turret-mill and a big Dean, Smith & Grace lathe not actually in use on my visit but obviously used for machining architectural components….. in sandstone.