The grass is always greener,
We built a pad 6 years ago, after using it for 5 years we went back
to unrolling bales in the field.
Mud and waste was our problem, we tore down a old chicken house,
25' x 125' and used the old concrete floor as our pad.
After the first year we put down 88 yards of 2" limestone all around the pad.
The mud just kept spreading. Year before last we noticed every cow had mud above their hocks all winter.
If you have good drainage or are building it on a ridge you might be OK.
Hillbilly