For the first cut, yes...
Not treated. Just western red cedar.
grade was aerage ,spartanurg sc store
did not require sanding
standard size is 1 1/2 by 2 1/2
I believe it’s only prop 65 due to sawdust. Unfortunately, 65 does not require disclosing the specific ingredients/risks. Plus products not sold in California don’t have to be labeled at all. We need both better disclosure and and actual protection (like get lead out of power cables) Here the wood is “green” ie not totally dry. This means as it dries out it will move around. “Rough” is roughly cut, won’t be all smooth and there may be big saw marks. In a raised bed these are fine. Another kind of wood to look for is “kiln dried”. This means the wood will be dry and no chemicals. It won’t move as much. This will look natural colored Avoid “pressure treated” = chemicals to make it better in different ways. This will have a kind of green color in person.
Yes, however how much depends upon your climate. In a dry climate like Colorado I highly recommend it---the boards will shrink and potentially warp. In a highly humid climate not sure it's necessary. I'd focus on good quality, straight boards.
I wouldn't recommend. It's raw and unfinished.