It is 11 x 9. I have about 14 in there I believe, all around 2-5 pounds.
I chicken wired the whole floor.
8 x 8 should be enough space. It really depends. My rabbits are super tiny compared to what you have, so they have plenty of space.
They have a pecking order, but for the most part they...
If you want Tris, breed that blue/fawn doe to the Magpie buck. You'll certainly get some, assuming one of the parents is broken. All the does you listen could produce Tris, but that first pairing will be most likely.