These gauntlets are waaaay to cool. They look as good as some of the best modern steel German gothic pieces made these days, but the idea of copying feathers, and the way it was done is just phenomenal.
The only thing I've noticed on all of your gauntlets is that you don't use knuckleridders. Is that because leather is too thick to make it possible or is there another reason for it?
It is a movable plate riveted to the far end of the metacarpal plate on those gauntlets with larger metacarpals. Fingers are usually attached to that plate, which in turn increases mobility and prevents gaps between finger plates and metacarpal.
To save some words check this topic on the ArmourArchive, and search for knucklerider as well. [link]