WOW this is why I love Permies! So many amazing ideas, Thank you very much.
First I will answer the questions. I have so many gophers it's pointless to plant in the ground unfortunately. To compromise my favorite way is to make a raised bed with hardware cloth on the bottom of the bed. I dig a two foot hole under the bed and filled it hugel beet style. The research I've done, and the good people of Permies have assured me galvanized steel is relatively safe to use.
Some of the beds are tall, and don't have contact with the native soil. I'm about to build a shadow tall bed for my brother-in-law. The answer to what kind of beds I make is all of the above.
I love the tile suggestion, but I don't have any, and for the most part I try not to buy any more than I have to. It's a good thing. I wanted the bed I'm building for my brother-in-law to be nice, so I bought the wood, and even using fence pickets, and 2x4s cost about 30.00. the next time I'm dismantling a pallet and asking myself if it's worth the trouble, I know it is.
For the one I'm giving away I think I will use flashing, or aluminum tape, or wood strips, because I want it to last a long time. For myself I think I will try stuffing the cracks with branches, or sunflower stalks, I have a bunch of those. I will find out how long they hold up, and if the soil will stay in place once they break down. I don't know why it never occurred to me, but I love it.
Than you are for the wonderful suggestions, I really appreciate your help!