greetings Hakatype! we spoke for a tiny bit earlier. Discord is terrible for textdumps so I'm posting here in response.
The fact that you added the stripe for " and ; so some non-QWERTY users could enjoy the theme is rad as hell btw. Will definitely spread the word with typist gang.
Your spacebars kit needs 2 3u keys, for 3/1/3 split boards. It doesn't need 2 1u's though; multiple 1u spaces is only an ortho/40s thing. (The duplication between 40s and spacebars is fine for KAM, I'd say. It means 40s users who want two 3u bars don't have to buy a whole extra kit...and also big board users who want them don't have to buy a whole extra kit.)
I can see you have added a couple of "Cmd" keys as a nod to Mac users to various kits. That's cool, but from various requests/complaints I have seen on GH I think you need to either go all the way and add full legend support, or just not bother because the key won't be used. For instance, on boards with 7u spacebar, the bottom row mods would be 1.5u dark blue Control, 1u dark blue Opt/Alt, 1.5u light blue Fly/Command, spacebar, 1.5u dark blue Fly/Command, 1u dark blue Opt/Alt, and 1.5u dark blue Control. You don't have the keys for this ATM.
Mac users may also be interested in F13, F14 and F15 legends since unlike other operating systems, these keys actually do things out of the box on a Mac.
...I also don't think anyone in 40s cares about having Cmd esp since it's an alias for Fly, but they're welcome to chime in on that.
40s kitPlease add the following:
A second 1.75u spacebar. 95% of boards that use this size spacebar need 2 of them. This shouldn't go in the spacebar kit though; I don't think there are any non-40s boards that use this size.
A 2u Backspace. This is an optional layout for boards like Candybar, JD45/Phoenix45, and other "13u" boards. This is not a huge requirement but a very nice to have, since this key can be hard to find for people who like the layouts.
Two 1.5u spacebars. Some Corne users really appreciate these. Bottom row mod keys can still be used for this, so it is not a huge requirement.
This would be phenomenal support because it's one of the more popular boards in the 40s space now.
With all the love and respect in the world:
this is not true and I don't want Hakatype or anyone else who might stumble across this thread to walk away thinking QAZ support is crucial/important.
No. QAZ is niche as f*** and it not being supported by a set is not in any way a real omission.
THAT SAID
Since this
is KAM, meaning all keys are the same row, nobody has to pay for expensive doubleshot molds, and the cost/minimum order quantity system makes child kits zero-risk?
I think it would be a very nice bonus if Soaring Skies were to add QAZ support to its 40s kits. It would obviously be appreciated.

If you wanted to minimize the number of keys, you could force the light blue stripe. It would look cute af I bet. And I don't think anyone would mind the additional cost on the 40s kit. (If someone disagrees, they are welcome to say so.)