The problem with transformable parts, is that, because the medium is paper, you can't really get the moving parts to stay where they are suppose to, so you end up with a floppy heap of parts that don't really stick to one mode or the other.
Having said that, it's not impossible either. There is a member on the other forum that seems to have done a nice job in getting the Shunichi/Getter1/Janx Veritech to be transformable.
However, with the amount of valks already available, I seriously doubt that one will be designed and released that way anytime soon.