I would look at the structures of these papers:

PWC: http://www.pwc.com/en_SG/sg/tmt/assets/tmtnews201402/digital_disruptor.pdf
Goldman Sachs: http://www.paymentlawadvisor.com/files/2014/01/GoldmanSachs-Bit-Coin.pdf
Bank of America: http://cryptome.org/2013/12/boa-bitcoin.pdf

And since this is capstone: I'm assuming you're business related? I would find a very specific business use-case that you can dive deep on (merchant payment t(x)) and show how btc can help solve that problem?

ACH transactions were $4.5 Trillion dollars
Global remittance is a ~$600B USD business yearly
Title Insurance is a $100B dollar industry - http://en.wikipedia.org/wiki/Title_insurance#Relative_market_share_among_U.S._title_insurers

This is just the tip o' the iceberg here are more ideas:

http://ledracapital.com/blog/2014/3/11/bitcoin-series-24-the-mega-master-blockchain-list

Not sure if anyone here has used PrivateFly with BTC or purchased any large items >$10K USD. Would be interesting to hear how the experience went and what they would change.