awesome, thanks for all the info!
I'll be planting a magnolia in the "island" (itll be more of a peninsula, a Florida with a swollen everglades, if you will) so Im gonna leave the hugel bed open and laid in the soil, with the pond liner wrapping around it almost completely.
So far I've got the design all planned out in my head and somewhat on paper, I just need to finalize my plans for the rest of the garden, get the budget approved and start digging! Ill post pictures when its done