I've got a completely transparent cockpit build for KSP.  Obviously building invisible stuff is pretty easy - ithe IVA view is just a sphere with a fully alpha texture mapped on it.   I played with adding navigation indicators on the inside of the sphere-  degree markers like a HUD to help maintain orientation, but different builders may want to set the zoom differently, depending on the field of view of their cockpit, how many displays they want to output, to, etc...  so I decided it was best to just keep it clear.   The clear cockpit IVA can be put into any ship in the program with a quick config file edit, but to make it more immediately useful to the kerbal community I went ahead and built a command pod with a giant window in it  to justify the wide FOV.  

I built the pod and IVA in Blender, processed them through Unity, and they just worked in KSP!  I'm going to do some testing to make sure it works properly in career mode then get it released on Curse so other Kerbonauts can start using it.