Over the last year I have documented with photographs the construction and evolution of a Banana circle we built in our property located in Comala, Colima, Mexico. (700 mts above sea level, 900 mm. annual rainfall). Following some recommendation I got from Paul W. at a PC conference in San Diego re. Hugelkultur, I went ahead and used quite a bit of wood in filling up the central pit. Results after roughly one year are great. You can take a look at the pictures with some comments in English at my Facebook page, (but please don't ask me to became a friend there since FB it is a family affair for me); the file is permies.
https://www.facebook.com/guillermo.romero.35762/media_set?set=a.250082198477209.100004262918499&type=3