Nice, Steve!

For the Wide(Angle) mod, I'd mention/show the 'Slash' variant that has the / key in the old RBracket position. I think it's superior by far to having the common slash key down in the dump.

The Angle mod images are confusing, a lot of info and strong colors. Maybe you could make them with only the changed keys showing, or the non-changed keys grayed out?

And you should of course have a link to the DH-mod page(s) there! :-)

Nice! And thanks for showing both DH-mods. ;-)

I'd probably add to the first sentence:
“DH mods, or Curl Mods, are specific to the Colemak layout although their underlying principle may be extended to other layouts.”
... and maybe go on to say in more general terms something like
“ Their aim is to deprioritize the center columns of the "home row" as these feel much less comfortable to many typists, and instead favour the lower-row positions reachable by a relaxed curling of the index fingers while keeping the wrists straight. Criticisms of the straight home row in the standard Colemak layout have led to the generation of some alternative layouts that may be inferior in other respects.”