Mullet enduro

[endur0]

I am looking to build an enduro bike mullet setup.
I was thinking of getting the p9 and using a 216x63 rear shock to put 27.5 back and 29 front.
Anyone done this? Should I put different shock instead? as 216x63 seems quite a stretch for the frame kinematics?

[stefanyo]

Saw a mullet setup with 216x63 on P9, which gives 165mm rear travel. looks great and owner had no problem on trails and jumps.