I added 2 new things to my skeleton mob killing machine:
1. A redstone signal. When a item goes on the wooden pressure plate in the stand point, It turns 2 redstone torch's back in my house on, Signaling me that items are ready to be collected.
2. Stop collecting. A lever is by the stand point to collect items, When turned OFF, A piston blocks the water so no more items can now reach the pressure plate until i turn it ON.