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I'm a hoarder and have a boarderline obsolete build kit sat waiting to be hung on something.
The plan was originally to turn a Scott Genius LT into a mini DH bike but that didn't happen.
So:
small/medium
27.5 wheels
150-170 travel
low standover
415-430 reach
65 ish head angle
To suit:
8.5x2.5 shock (float x2)
142x12 rear (DT Swiss FR1950 so boost endcap conversion possible, so not a deal breaker)
170mm 36 RC2
Genius LT
Transition Patrol 2016
Devinci Spartan 2017
Yeti SB6
Pivot Mach 6
If your going with a frame optimised around a 160 fork, pick the one with the steepest seatube and lowest BB as you will be raising it 10mm!
Commencal Meta SX and Canyon Torque are dedicated 170 travel bikes with 142 rear axles. There are others but I can't remember off the top of my head.
I do have 150/160 airshafts also, but good point