I can see where your ideas come from and I don't think you are a scammer
, but I don't think it's realistic:
1) BTC is Decentralized, while USD, GBP, JPY etc are not. If you open a "bank" operating both asset class, there is no doubt you will be regulated by whichever regulators in the countries your business is based, especially if you are going to offer "interest" on deposit. That compromises the "Decentralized" nature of BTC. For example, if you are based in Cyprus and they decided to take 10% of "all savings in banks", I am prettly sure the savings (BTC and real currencies) in your "bank" will be affected.
2) I don't see how it is possible that any of the physical currency deposit (USD, GBP, JPY, etc) will be eligible for deposit guarantee (US FDIC $250k, £85k in UK). That makes saving at your "bank" very risky.
3) If you are setting up your business as solely using BTC as "Payment Clearing System" for other currencies, that's basically a BTC exchange, not a bank. And there are plenty of exchanges around for this already (though all of them have needs to improve massively). The fact that the established BTC exchanges around the world constantly have problems with physical currency payment is also a proof of difficulties mixing BTC with physical currencies.
3) Your business will most likely be the target of Money Laundry activities and be heavily regulated by Anti-Money Laundry Regulations. This not only makes "saving" in your business insecure (as your business could be shut down by regulator any time). There is already plenty of negative news of BTC associated with drugs and money laundry. The last thing this community needs is more association with money that are illegal.