Hi proton,
Do not let any one to tell you "YOU CAN NOT DO".
Start from sand, go trought to silicon.
By the time develop some hardware for silicon process and bonding.
But do not forget to provide dust free environment. (Use grandma vacuum cleaner)
And try to fit your desing in a JEDEC case please.
Never give up, you can produce a 500k gate ASIC within only 10 years for prototyping.
Mass production will last a little bit longer, say 30 years
Best Regards.