From the series better late than never... I opened my NU-1 and made these measurements. Ando is right that the keysticks/fulcrum are shorter than in other pianos.
I did not remove the bar from the top of the keys (like in the picture 05, unlike picture 01) so my measurements are a bit approximate, but I took care to be as accurate as possible in the measurement.
So here are the numbers:
The keysticks length is 18.5cm from the tip of the key to capstan pivot point for the white keys. The number for the black keys is 14cm (from the end of the "flat" part of the key, not from the very tip)
By comparison, the same numbers for my 100 year old grand (Apollo) are 24.5cm and 21cm respectively. Note that in the latter the "playable" part of the keys is (annoyingly) shorter: 14cm for whites and 8.5cm for blacks, whereas the NU-1 has them at a more comfortable 15cm for whites and 9cm for blacks.
My notes for the sizes of a Howard upright which I don't own anymore are 22cm and 18.5cm, so the NU-1 has shorter keysticks compared to this upright too. My notes do not say how long the "playable" part of the keys were on the Howard.
Surprisingly, the difference in feel from the front of the key to the back of the key on the NU-1 is not bad at all, and in fact it's very similar to the difference I feel on my grand. Probably the fact that the NU-1 has a definitely heavier action than the grand plays a role.
Hope this helps!