We can not identify a suitable PARTIONING KEY in TRANS_DATA to setup partioning. With 11.2 VIRTUAL COLUMNS are supported to provide this PARTIONING KEY. With a timestamp in the physical record one could easily define mod(to_integer(day((created_timestamp)),20) as a virtual column to create such a partion key for 20 generations.
Please bear in min that the current defined LOB Datataypes are NOT reorganization free and require regular re-organization.
Alternativly you could support secure files instaed of LOBS here.