Re: How many entrance holes?
I use (5) 3/4" holes down low on the end. I use wine corks to keep only the desired number open. During winter I only have 1 hole open. I keep the entrance holes about 1" above the bottom so that I don't have an issue with dead bees piling up and closing the entrance. I too like a landing board. It's nice for watching the bees. There is always some sort of activity on the landing board where on hives without more bees will fly straight into the entrances.
Beekeeper? Shoot, my bees keep me!