Isam, that work is impressive... not sure if your tearing down goes that far, but you may consider doing an R/R on the chain guides, since you've got the M62 - my 4.6 M62 kicked the bucket due to the chain guides... the failure was so catastrophic, that the metal housing of the engine just broke in pieces...

as far as battery goes... i've shipped my car around, and the shippers did disconnect the battery, but it was the crude way, they dug into the rear tire area and disconnected the battery... the battery still was flat after the first shipment but was ok after the shipment to Russia... after reconnecting the battery though the nav system was fried...

once a battery goes dead, in my non-scientific opinion, it is compromised... lol...