Dear Krissa, thanks a lot for the suggestion. I COULD make these vehicles available in 1/48, but they would cost roughly three or four times as much as they are now, the way Shapeways calculates their prices. If you are happy to shell out a couple hundred dollars, let me know and I will gladly make the models available in whatever size and scale you need.
However, these vehicles were never meant to work with the Grenadier miniatures, they are rather Hot Wheels sized and so is the amount of detail. The more I enlarge the models, the less detailed they will appear.
Anyway, thanks again for your suggestion and as mentioned above: If you really want them, let me know and I will make them available in 1/48.