[Tristan Lall]

Are you looking for a detailed model with every part represented, with which you could make a copy of the engine? I'm sure their competitors would love to have that, and for that reason, you don't stand much chance of getting it.

But would a single solid chunk with the right proportions work for you (e.g. to design the interface with the rest of the vehicle)?

It wouldn't hurt to ask the manufacturer for a copy of the latter. Who knows if they would be willing to do it, but it's not much effort for you to give them a call.