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I never tried "Collide With Objects" method, but the simplest way to me is to add that box as static object (deforming geometry). I only changed velocity type to "volume" (collisions tab in solver) tankTest_02.hip
Here is a small example. Part of it is from odforce thread about transfer maya guides to houdini. All I had to do was add some nodes to move guides with skin geometry. Align node measures difference between normal angle of rest and live geometry and transfers that information to your guides. To transfer guides you can use .iges file, depends on software you use points order on guides can be different, so there is another way to calculate hair root position. If you have any problem just ask hair.rar