So sorry for your "travels"
As many of us know first hand, getting older isn't for the weak!
The stream does extend farther to another upper pond and another upper stream... this video from a few
years ago probably shows the whole layout the best:
https://youtu.be/K8_4fyX2DKw
The foam media was actually what came with the planter when I bought it but I bet you could make something
similar with just Jap Mat as that is what it seemed to be. I'll look but I don't think I have any pics of the actual
material. I've made other "islands" and it's really simple from stuff you can find at craft stores. Here's an
old thread that can give you all kinds of ideas:
https://www.koiphen.com/forums/showt...sland-under-20
Be sure to show us what you come up with when you get started!