ch_giygas_b3 is a very old map of mine. It was an attempt at making the area leading up to the giygas battle. If I remember correctly, one of the developers of chimera hunt joined a server I was playing in, only to hear him say he hated this very map.
...So it's a pretty good map, probably!
(it's actually not, and makes the chimera very heavily overpowered as there are no locations for the pigs to hide, and very little area for them to even run away towards. Kinda fun though)