There is some talk over at the prop makers forum that there are some clips of this doc on the web here are the relevent links:
the clips:
http://www.esthervanlieshout.nl/Making%20of%20Empire%20Strikes%20Back.mov
http://www.esthervanlieshout.nl/Making%20of%20Empire%20Strikes%20Back2.mov
and here is the link to the discusion in the prop forum:
http://www.therpf.com/index.php?showtopic=126975
Aparently it's not the making of doc ,is it the one you have been talking about?
Wookie Monster