Slitherine

So a linear obstacle, in 28mm, can be from 20mm-30mm x2 (as in, twice the depth of a field fortification). That means I could make a hedge or such 60mm deep.

Any thoughts on what depth would work best and why? Is there some reason for making the thing 60mm deep? Or is narrowest, 20mm best? Or it makes absolutely nooOooo difference?

From what I have seen in the rules depth does not make a difference on game play. You can move across it at no cost and still have to be touching its rear base edge to gain the benefit, not sure that standing on top of it will give you any benefit from it. I think it was made so wide for the more artistically gifted gamers who want to make a really nice looking obstacle with stuff around it etc. You don't like my nice bendy hedge??? I am hurt, looks like this insult will bring the wrath of poodle down on you, yet again

The only thing I can see is, if the obstacle is 60mm deep, your BGs defending it are 60mm back if they decide to turn and move away. If they move forward, I assume you'd measure actual distance, so it would take foot 2 moves to get across it. But if you were to pursue broken enemy after fighting over it, you'd gain those 60mm during pursuit.

Suppose its like defending artillery, you are assumed to be at the front of the base so would pursue from there??
Hadn't pondered that problem, so I say go skinny it will cause less problems later.

Has that problem been solved ?

The width does matter tactically - thought I would start a new thread on that.