***REMEMBER***

In 3DGS 1 "unit" is equal to 1 meter.
Soooo...

If the engine needs your character to be at least 86 units all; Set 3dsMAX's measurements to "metric", create a cube that is 86 meters large (L,W,D) make is transparent, freeze it and use it as a modeling guide when making your characters.

Hope that helps you!