Looks great.. I printed this one and I like the larger diameter of yours.
https://www.thingiverse.com/thing:4876148
Are your STL's going to be available?
Dang.. Reminds me of hay wrapping on drive shafts on the farm.. That will be a job the pinion will need to be completely removed to replace the seal. The first time I "used my skid plate" was from highway debris.