Sorry for kinda resurrecting this thread, LSB, but I was wondering the same thing about hydro dipping an HHKB. The worry for me is that the layer of film on the case mounted housings. I wonder if that would create any issues. What do you think?
I had MorbidStix dip my KUL case based on this post. My observations is that there is some thickness added by the process. While the hydrodip transfer layer is only a few microns, I think the clear coat and primer that MorbidStix uses in addition adds some thickness. That said, unless the part has some extremely tight clearance, you should be fine. I don't know what the HHKB clips look/feel like.
A good thing to consider is that people use hydrodipping to cover their guns all the time. If it was too thick there, it would cause jamming of the firearm. Rednecks like the security of having a gun that is always ready to fire, so if it jammed, we would have heard about it.