You should do some searching - there's several topics and posts about what is required for a chip design, miner design and protocol design. A lot of it from late 2012 through mid 2013 when a lot of companies were getting started. Plenty of resources outside of BCT with regard to ASIC design in general.
What you need most is 1. people who know what they're doing and 2. money. (enough of 2 will grant you 1)
Outside of startups that try to get funding privately, there's never been much movement in ASIC development; most supposed attempts stranded or even turned out to be scams.
Poke at
PlanetCrypto about his plan for developing an ASIC and a miner; was hoping he'd have a thread by now, but most of his posts on the topic can be found in
GekkoScience's thread about their miner development based on an existing chip (where you'll also find some notes about miner design, as well as in
this thread).
Tickle the brain of
2112 if you want a dissenting view on how ASICs and miners are currently designed.
