K67? You mean Corsair K65?
I have not seen any K67 model.
Most mechanical keyboards with Cherry MX switches (and clones) in them have the switches mounted in holes in a metal plate for extra stability and weight. In the CM Storm Quickfire Rapid-I and most other keyboards the metal plate is inside between a plastic bottom and a plastic top. In Corsair's keyboards, the plate
is the top.
Here's what the Rapid-I looks with the top off. There are holes for plastic posts and screw holes for the top part of the plastic case.
However, if you use it like this then the bottom would fall off when you lift it. Maybe you could modify it with a thin cover plate that would go on top of the existing plate.
If you like red, you could get the Arachnid Recore, which has a red metal plate exposed but is as small as the CM Storm keyboards. I don't think it is available in Portugal, though...