Just one thing (maybe the author reads this):

The nicest way to avoid the "oh a lot of boilerplate!"-problem with implementing "Add" for a custom type is by using the "derive-more"-crate. Then you simply put a "#[derive(Add)" above your struct. That was the initial reason I switched to Rust myself: because I was writing a dynamical systems solver in C++ and had to overload arithmetic operators for my state-struct. But doing this was so complicated and I never felt sure of it performance wise (what if one side is a reference? And so on).

In rust I have a macro and don't have to ever worry about that again.