I decided to try some new things on my own bike, the main thing was to have it rideable all year long with the ability to swap from 29x2.6" to 27.5x4.5" tires. To achieve this I build two rear ends which are swappable for the seasons along with a wider crankset spindle.
Lots of water bottle mounts so that I can swap things to carry depending on the season.
120mm rear travel and 140mm front for summer and then 120mm rear with 120mm front for winter.
Rear linkage is a linkage driven single pivot with flexing seat stays.
If you want to dive into the geometry, I'm 5'8" for reference. This bike is long with a very forward seated position!