The Ha'tak seems mostly plastic too. The death glider I don't know. The F-302 is the only one that's mostly metal. I don't know why some of these were advertised as diecast when they're just plastic. But despite being mostly plastlic, the Ha'tak is a nice collectible. I really love it.
I was never a fan of this ship cause it looked a bit off to me. I guess it was the lack of texturing on the cg model. Now that you've showcased this model, I now really want 1 of my own. I don't even watch the show, but a good design is a good design. I need to pick one up. The craftsmanship is amazing!