This sounds fantastic! 
As you know I’ve also been looking at implementing a FUSE drive in Rust, based on Syncer which I now understanding well enough to pull to bits and adapt to the SAFE APIs.
One of the things which I noticed was that it would be much cleaner to implement directories, files, links, symlinks etc as nodes as Syncer does, so the FileTree approach could give us a much more conventional filesystem which would be excellent. The Syncer code seems well thought out and clear, and might well be a good starting point for your own Rust FUSE. I can share my notes if it would help you review the code.
I’d reached the stage where I was ready to have a go at a FUSE mount of the current SAFE FilesContainer, by using about half of the Syncer code, bypassing its disk caching and plugging it directly into a SAFE backend. However, I think I should put this on hold!
I had also started to look at how the SAFE API and core libraries work in order to implement caching for speed, and streaming read/write which are important for many applications and POSIX compliance.
I’ll keep poking around to improve my understanding, but am now wondering if there is much point in me continuing the work I had planned?
I’m happy to collaborate or to take on a sub-project, or equally might go back to some one of my other projects that I set aside when I stumbled on Syncer. I’m new to Rust, but do feel ready to have a go at something reasonably complex, having read an awful lot of Rust code in the last couple of weeks and made lots of notes to understand how it all works.
So @Maidsafe, please have a think and let me know what options seem sensible. I’m quit happy to step aside as I have lots of other stuff to do, but I’m also quite keen to try doing something in Rust while I’m up to speed. So I might have a go at something regardless.