Hi there,

post package dimensions would be 90cm x 50cm x 6cm. Weight is 2-3 kg. Therefore to 3805 is around 17 bucks - allow for 20.
Yes it was slightly restrictive with the airflow. Mind you I had a T25 roller-bearing turbo giving a lot more air than standard T25. An A12 turbo set up should be fine.
The blackstone units are known for there efficiency in cooling air- all aluminium and very light with plastic end tanks.