Welcome to BYC. Where, in general, are you? Climate matters, especially when it comes to housing.
Those are some serious predators so I think that your priority should be a strong, secure coop with a strong, secure attached run and then consider a mobile day pen after the core facility is established. Dogs have been known to flip lightweight, PVC structures.
Here are some numbers to help you figure out what you need.
The Usual Guidelines
For each adult, standard-sized hen you need:
- 4 square feet in the coop (.37 square meters)
- 10 square feet in the run (.93 square meters),
- 1 linear foot of roost (.3 meters),
- 1/4 of a nest box,
- And 1 square foot (.09 square meters) of permanent, 24/7/365 ventilation, preferably located over the birds' heads when they're sitting on the roost.
6 hens
- 24 square feet in the coop. 4'x6' is the only really practical build for this given the common dimensions of lumber. If you can't walk into it, put the access door in the middle of the long side to make sure you can reach all areas of the coop because a stubborn chicken WILL press itself into/lay an egg in the back corner where you can't reach.
- 6 feet of roost
- 60 square feet in the run. 6'x10' or 8'x8'.
- 6 square feet of ventilation.
- 2 nest boxes, to give the hens a choice
8 hens
- 32 square feet in the coop. 4'x8' is approaching the limits for a non-walk-in coop even with the access door in the middle. 6'x6' should be walk-in because even the tallest chicken-keeper won't be able to reach the far wall.
- 8 feet of roost
- 80 square feet in the run. 8'x10' is a nice looking number but, remembering the common dimensions of lumber, a roomier 8'x12' is actually easier to build. 6'x14' looks good on paper but would require a lot of weird cuts.
- 8 square feet of ventilation.
- 2-3 nest boxes.
And an article on why these numbers are guidelines rather than rules carved in stone:
https://www.backyardchickens.com/articles/how-much-room-do-chickens-need.66180/
My run is 100 feet of Premier 1 electric poultry netting -- roomy and easily mobile. I highly recommend it, though with the caveat that it's only good against ground-based predators.