skippy filter, portable bottom drain

I have a 3500 gph pump, with a strainer, I am using in a new pond. I am
going to avoid a skimmer as I will have a large amount of floating
plant material.

1. Build a skippy or just buy a filterfalls? I am wondering how big a
skippy is needed to handle 3500 gph flow.

2. How much more efficient would the addition of a portable bottom
drain make this setup, or is it moot without a settling tank?

Tia,

Nort