Nicholai G 16 2017 can be built up as 29 er, 27.5, (155mm rear 175mm rear), or 29 front 27.5 back ( which apparently you would have to prize out of Chris Porters hands!!) Chainline (see below) also rates the 29/27.5 very highly.
look for long discussion (37 page ) on STW and contact “chainline” re options set ups etc, and can organise a demo
can be built light with non piggy back shock, and 34 s or Burly with X2 and 36s
Unique, rare, alloy and until you have ridden one then it is impossible to imagine how competent they are.
Cockpit will be as you want it seated, but the reach and front centre give one a very centralised position for descending, which until you get used to it is slightly strange.
The seat tubes are relatively short, so long droppers can be used, at 5,10″ I would ride a longer ( as a true 18 inch 460mm seat tube bike for me is almost too long to run a 150 reverb), 502 reach, but I think Chainline (same height) now rides an longest or even extra longest.