It's a solid casting. The wheels are cast on a base that the whole thing sits on, but can easily be snapped off to make the model as in the picture. Very nice kit!
And we have several options for your urban assult vehicle. We should have three modern HMG style turrets up in the moderns section of the shop.
As for the other models. we don't have the BTR's or the Toyota yet, due to the long casting que with our suppliers. But, if there is interest, I can offer them all up on shapeways site for print to order. If enough folks bought them, that would help pay for the eventual resin and metal molds.
The Toyota in the picture is a shapeways (white strong flexible) print. I have a pretty good formula for painting these style prints to eliminate any residual texture issues.
-Brent