Hi,
This is Tucker of Tucker's Coops...
I love building coops and believe I build the best coops available on the market, because I actually care and enjoy building quality products.
I use pressure treated 2x6s for my larger coop's floor framing where other use untreated 2x4s
Also use 5/8"pressure treated plywood on the floor where most use untreated 1/2" OSB
In my base price I include Glassboard flooring and an insulated metal roof.
As to the concern about using staples, they are best fastener to use at a butt joint and are actually there just to hold the frame in place until the 1x8 solid pine board and baton is nailed to it.
You will not find a more sturdy coop!
Thanks
Tucker