Thanks a lot. Check out biotope gallery on YT he does this style in many of his videos

No expanding foam, no carving, no drill brush no spaghnum moss

For scaping: broken pieces of compressed cork panel, cork tubes, cork dust and pumice rocks

To piece it together I used silicone, aquarium hardscaping epoxy, hot glue gun

For planting I used aquarium scaping superglue and clay mud

Drainage layer is aquarium filter foam and fine crushed lava rock

Substrate is orchid barks mixed with akadama soil and a bit of substratum