Hi there,
The posts you are referencing are quite old- from 2005. Are you using SH3 with the GWX 2.0 mod installed?
First off, the icebergs portrayed in GWX 2.0 are really good IMHO. You will find the icebergs here: SH3 Mission Editor, (In the tabs on the Right side Top) Sea, Environmental, ...
Next, notice under environmental there are seven different icebergs you can choose from Iceberg, IcebergM1, IcebergM2, etc. (I am viewing this with a Mission Editor in SH3 modded to GWX 2.0) What do they look like? Drag and drop them into your test mission, then run it and check them out. I can tell you this: PLACE THEM ONLY IN EXTREMELY DEEP WATER! If not, you will observe a truely bizzare spectacal of an ice spike sticking up in the air 1- 2 KM high!
Hope this helps.