Cloning Steem is possible. It has been done before but not very successfully so far I believe. It's also pretty expensive to buy all the infrastructure yourself.
I fail to see why anyone would go that route though when you will be able to make an SMT for 10 sbd on Steem and utilize it in your application or community.
You do need access to RC's but you can lease them if you can't afford the STEEM straight up and increase the leases with the growth of the organization.
It's a much cheaper, easier and faster option.
And besides that, if you clone Steem you will have to somehow get your token on an exchange for it to become tradable. With an SMT your token will be tradable straight away and you will have access to instant liquidity.