What data do you want,blueprints....that ain't possible,everyone sells brochure not the details .......no one but the testpilot at HAL claimed so,and here people justify such....We are buying Rafale since over two decades ,and it's no new...the cockpit design it is bringing will gonna be obsolete within a decade and more and more aircrafts will be featuring the new Wide area display design......
Instead you should also have visited DRDO website defence science journal,also as per Lockheed 70 stealth comes from the design and that's why you don't see US with all advance stealth material claiming that the new F16,f18,f15 will become stealth like that of China.....
The RCS depends upon numerous factors,the ones you stated are the frontal RCS(and that's too if doubt is totally false)and that's too for PR....Now comes to research paper,their are many papers in the DSJ such as on radar absorbent surface(RAS:-glass epoxy composite),Jaumann wide band EMW absorber,metamaterials....the property of metamaterials are that they absorb 99 percent energy of certain wavelengths and are applicable on narrow band,that is most probable for the X band aircraft in the vicinity....Their are various other journals,just go through the DRDO website,publication,defence science journals,Archives,issues,materials and search for the stealth material related stuff........