What bolt was so tight that you took a chunk out of the cam ? You should never try to use the timing keys to hold the cam to undo the front pulley bolt.

The vvt solenoid is an actuator not a sensor.

Now I love the way you have got stuck-in but have you priced things like gaskets and stuff to rebuild it ? The costs make them dispossable.

But do carry on as it saves me the bother

The oil cooler is an oil cooler but it also serves to warm the engine oil up faster.

Block, crank, oil pump and sump ect is the same as any blacktop.