I'm semi convinced, but not wholly convinced with those new symbol mappings. I need to think about it more and hope for a moment of clarity on the issue.. (that's quite a lot to hope for)

having thought about it some more, I do use the £, $ and % quite a lot, but I also need # and ~

so having both sets approx of equal value, I think I may as well stick with the original qwerty number row lay out just for the principle of not changing if unnecessary

I use ; and : a lot so home row good for those two

So in summary, I think I will stick rather than twist on the symbols.. juice not worth the squeeze for this particular mod from my personal perspective

just had a re-look at the seniply page
looks like symbols and numbers are now different layers altogether
wondering whether to upgrade or not

Currently giving it a go.

Prob will take me a while to get used to.

Particularly the different thumb key to layer positions.

Where did you get those cool low profile thumb keys?

so your number layer is thumb under the 'c', symbols is thumb under the 'h' and function layer is thumb under the ','?

I got the key caps from ebay - I can't find the exact same ones but these look similar.

I've always had the same order for the four main layer selection keys: Extend outer left - Shift inner left - Space inner right - Symbols outer right. You can adjust them if you like, but I do think it's important to have Shift and Space as the two inner ones. The function keys can be selected either with the key below comma, or as before by holding both Extend and Symbols.

The new thumb-related thing is the number-layer selection key, which as you say is below C. I find it works quite well on the left - being the opposite hand to the numbers - especially for long number sequences. If the Atreus had an additional outer layer of keys, I'd probably have it in the CapsLock spot instead.

Good spot on the Qwerty layer R key. In reality I rarely use that layer (hence not noticing the error), but I thought it would be useful for certain situations e.g. gaming where you don't want to rebind keys. I have fixed it.

steve have you got to the point where you rarely make a mistake with your thumbs?

for some reason, I seem to have stupid thumbs that struggle to remember what they should be doing.

at least I can currently blame their behaviour on a change of layout ;)

My thumbs mostly are well behaved now ;)  Extend and Symbols are quite solidly in my muscle memory and work well. Yeah, I also am enjoying _, plus pipe | and backslash \ being only two keys is nice too.
The new number-thumb took a bit of getting used to. Probably the most common one I have difficulty with is Shift: the left thumb sits over Extend but has to move right for shift and left for numbers, so coordinating that can be a bit tricky, but I anticipate I will adapt.

Yay, looks great! Although actually mine is now slightly different from the photo - since my function layer key is below comma, I have the "Fun" key there now, and the butterfly key is my number layer selector (below C).