Yours is pretty stock. I'd restore it and sell it, then buy a cafe conversion already finished (or close to it). There are tons on E-Bay selling in the $2k range. You're going to easily spend that on your conversion project.
Here's a nice one (although over-done) that just sold for $2550:
http://cgi.ebay.com/ebaymotors/Honda-CB-1975-HONDA-CB-750-CAFE-RACER_W0QQitemZ290256065305QQihZ019QQcategoryZ8064 7QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
And another so-so 750 that sold for $2684:
http://cgi.ebay.com/ebaymotors/Honda-CB-1973-CB750-Cafe-Racer-CB-750-Turn-heads-everywhere-U-go_W0QQitemZ270264656346QQihZ017QQcategoryZ80647QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem
I know you already have the raw stock, but your two disclaimers (cheap & lazy) would be enough discouragement to motivate me to buy someone else's "dream".