Moved this topic to the child board "Beta / In-Progress Maps". Please post new maps there only.
You should make the filename all lowercase and use beta extensions. I'd also avoid gamemodes in the mapname, maybe something like castle_b1.
Make sure that you put your pball textures in ...\BSP\pball2\quake2\pball\textures\pball and not in the ctp1 subfolder.
Maybe run a final compile and post the .bsp file or screenshots here, that people can see the map so far.
Poll