but I'm sure that you are aware of the fact, that if rules refer directly to size of models, than there will be a group of players taking advantage of it
E.g. if line of sight is determined by taking measurements on table only, some ppl will cut (sorry, convert
) their largest models (wraithlord, demon), so that it can be hidden behind the smallest bush.
if size of a trukk determines amount of models that could be transported, some ppl will create a multi-floor monster-trukks.