There are always some cool parts on most RRB builds, but I don't think I have ever seen a parts list for any of the builds.
Here is my partial list so far.
1960s Chrome Spaceliner Frame and Chainguard
1940s Snyder Hawthorne BeeHive Springer Fork
1960s Murray Meteor Flite ladies rear end drops and seat stays
1960s AMF Skyrider Star Chainring
1940s dogleg crank
1954 Chevy hood ornament wings
1953 Ford jet hood ornament wings
1960s twin tube 5 speed muscle bike shifter
200x Schwin SS Sport black rims
200x Bontrager Redline Hank tires
2012 Shimano Nexus 7 hub
200x Clubman motorcycle handlebars
2012 Rat Rod Bikes 007 Headbadge
Rear suspension based on 1939 TwinFlex (not really a part, but cool re-use of old engineering)
More to come for sure!
What are you building with? Sometimes it's easy for the rest of us to miss some of the cool parts that you are using.