I like the top layout, what size are the spacebars though?
The top spacebar is 4.5U and on the bottom is a standard JIS 4U. The 4U should fit 66% PCB's such as the Clueboard (which will accommodate a full JIS layout). The other 2 spacebars are 2x 1.5U keys for Japanese split keyboards which was requested by the Japanese community. I would also like to add a few more options such as a 3U for minila layout PCBs.
Had no idea there were so many space bar sizes for JIS.
The Filco Majestouch JIS keyboards are an example of ones using the 4.5U spacebar.
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(https://2.bp.blogspot.com/-FhtB2_8Wpxg/VzJGBBpVf_I/AAAAAAAABaY/pUWUOx-k4FcbhljZZhdOVcQv3ItbN9x8wCLcB/s1600/full%2Bboard1.jpg)
Signature Plastics has a 4.5U mold for their SA keycaps. I know because I have an old JIS set by SP that was made for Filco. It's 2-2-3-3-3-3 profile. Unfortunately, it only has English characters. (sorry, non-JIS version shown)
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(https://mechanicalkeyboards.com/shop/images/products/large_2076_SPKCS104D_01.jpg)
Also noteworthy is the SA Laser Cyberdeck kit. This tooling was recently created by SP.
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(https://mitormk.files.wordpress.com/2019/04/25-cyberdeck.png?w=768)
The new tooling for SA Laser Cyberdeck kit + SA 4.5U space could be a starting point for a purely-JIS focused set, if you're interested in JIS & SA.
My design is based from the Majestouch JIS directly. I've updated the renders to show the different layouts more clearly. I'll be working this week on better renders. The layouts are in the following order:
Normal
66%
Minila
Split
Mac
Thanks, I'll look more closely at the SA Laser when I contact them.