I am just now trying to fruit my first cakes, so I can't personally vouch for it, but fattrout pointed me towards this design...
http://www.shroomery.org/9047/Poor-Mans-Pod
It only cost me about $33 to make (including the expanded clay pellets), and mine should hold around 5 - 6 cakes comfortably.
http://www.shroomery.org/9047/Poor-Mans-Pod
It only cost me about $33 to make (including the expanded clay pellets), and mine should hold around 5 - 6 cakes comfortably.