Although its not diecast, it sure is a great collector item. I have 2 of these, one of which i've assembled as an operational aircraft. The other, I will later assemble as a display piece. The item description can be found here:
TMW Zero Fighter 1 Box (10pcs)
Some can still be found on ebay and is quite a hit in Japan. I'd really recommend it. No painting is required and the detail is really exquisit. Here are some photos of my assembled model. But the exposed model is really an eye opener and will definitely look forward to displaying it like that. Like your own little musem model at home!