cool, you're up in my neighborhood, we have sol much from nature we can use. Almost all hardwoods are safe if completly dried, and sanitized, 3 varieties of mushrooms that grow on birch, all shelf mushrooms are eddible, if yr starving?!?! LOL!! U can probably find a nice drift wood some where, looks nice and a great hide!!! I think u can pick them if they're beached, but not submerged in water, check your local laws. Moss doesn't hold up long because it's variety needs a frozen spell, but moss that's on a stick (after baked) will grow back slowly, and don't forget to pick some nice beach rock, as they love to cool themselves before swimming. Kernit and lump have a marble ball from a fountain and a old cue ball. They perch on these every night.
I am going to do moss on a screen for a bottom, as soon as greenhouses open, maybe a couple kinds of Spanish moss. I'm going to be able to lift out moss sheet to clean. Also, I know what it's like to have physical problems, mine is arms and hands, and I find whites low maintanance, pick up poops 2x a week, and wipe down favorite perches 1x a week, and change water ev day. I use a turkey baister, so I'm not fumbling around with the big bowl, paper towel wipe up, and viniger water mix to spray it out 1x a week. Viniger competely evaporates and kills germs and bacteria. I did my first cleaning after 2 months, took hours, but was suprised I can go maybe 4 months between full cleaning. But I have allot of plants and rock.
I can't wait to see what u do