When I made the books it became apparent very quickly that I either had to make one giant book that could fit everyone's hands, which would look horrible on small models. Or, make 3 different book models that were scaled and positioned differently.
As a rule of thumb, small books work with all female models, medium books work with all male models (although small works better with some races), and large books work with half-orcs.
Here's a screenshot guide to show which models have hand clipping (issue for male models or pheno 2 models), or how the book will be held in the hand and if it is floating (issue for female models).
