Hi Christoph,
So, all of the naval unit pictures on the website are the Skytrex 1/3000th scale ships - there are some good close-ups of these on the game design page and in the example of naval combat thread in the discussion forum. You can get a sample of what the tumbling dice miniatures look like in the first picture (top left corner) on the design page. The picture on the top right has French and British tanks from GHQ. The German tanks are from Skytrex. The Summer 1943 screenshot (4th picture down on the left side) illustrates some skytrex Tigers and Panthers. For a game, I think the skytrex pieces are better because of the bent gun issue that Spitfire discusses. While the quality does not look quite as good as skytrex, they are miles superior to the plastic molds.
As for planes, you will need pieces to represent the following:
German fighters, Stukas and medium bombers
Italian early war fighters, regular fighters and bombers
Japanese fighters, bombers and Kamikazes
British early war fighters, fighters, bombers and heavy bombers
US fighters, bombers and heavy bombers
French fighters and bombers
Soviet early war fighters, regular fighters, Sturmoviks and bombers
Hope this helps,
thanks,
Mark