Sounds good!
Note that a "time stamp" is expected to include the transaction # (not id - I mean # of the tx in the block). I have discussed this with CfB and that will likely be the lower 40 bits of a 64 bit "unix time" shifted to the left with the remaining 24 bits for the transaction # (allowing for a max. 640K txs per second which I am assured Bill Gates agrees we'll never need more than).

2^24 tx per block= 16777216 tx per block or approx. 279620 txs per sceond?
May i ask what events in the blockchain can trigger the execution of the AT code?
Is the "AT owner's account" a usual account that can not control its funds after the AT has been activated? Instead only the AT can access its funds?
Do i get this right?