You can find whatever details you like about unit and structure grps file at this site:

http://www.staredit.net/maplantis/index.php?sid=f976d8a409;pg=mods

Also, you'll want to check which version of the game you're using.  Later versions from the 1.0 release (ie major changes in 1.07 and 1.08) changed many of the path behaviors of units, so you may see units do things in later versions of the game they could not, or usually could not, do in earlier versions.  If you're automatically patching from Battle.net, you'd see this behavior possibly change, whereas if you do not, you might see different behavior in your (earlier) version than someone else's version.

In general, except for actual ground obsructions and walls, zerlings can run through all "walls" between buildings.  Other units cannot do this.  It is not necessarily a question of the size of the sprite of any particular unit/structure, but of how zerglings are set up (as being smaller than the minimum distances between any structure).  There is no 100% building wall barrier against them.
Source(s):
http://www.staredit.net/maplantis/index.php?sid=f976d8a409;pg=mods

Having worked on and enjoyed playing many modifcations for games such as StarCraft,


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