==Well, there is no technological barrier preventing the Chinese from building something like F-117 right now, but something like F-117 is pretty useless for China. Remember, in the past 10 years, the technological gap between China and west has been narrowed from over 30 years to less than 15 years, the US forces deployed in the Western Pacific already holds little advantage against the Chinese.
If you notice in this very same website you will find out than China already have proyects for stealth planes but yet haven't build anything like it jet. If you mean the F-117 is not a big deal I agree with you. The only 2 things that make good this plane is the ground attack capability and the stealth. Despite that i can't take away too much credit from the plane that did a great job in the scearies tha U.S. use it. did you have idea how many radar stations and missiles the f-117 avoid before get shootdown in Kosovo just because the weapons bay dind close? Even the J-10 is intend to have some stealth charasteristic. Remember the very early J-10 desing with the air intakes like the F-16s? Well production model have the intakes like the EF-2000s and the Mig MFI (1.44). I agree the J-10 may be superior than the American F-16s, F/A-18s and even the Russian SU-27s but still not a 5th generation fighterjet. I dont think The PLAAF agree with you when you say something like a plane like the F-117 is useless tho them scince they attemp to provide some degrees of stealthtiness to the J-10 and have projects like the J-XX to produce stealth fighters. Proyects like that dind take a week for success. Even U.S. take years of research and billions of $ to produce stealth planes, in the other hand we have Russia that may have some sort of stealth technology at least we can see the demonstrators like the S-37 (SU-47 Berkut) and the Mig MFI (Mig 1.42 or 1.44) shamefully Russia couldn't not afford such planes and have in mind projects like the PAK FA but gonna take few years in fully success. The reallity of today is that U.S. is the only country who can produce stealth planes. Believe me whe I say than China (or any other country) that want to avoid their planes to be shootdown will required to have stealth planes.