Most of the build books I've seen have been sectioned by mods: Engine/Drivetrain, Suspension, Interior, Paint and Body and sometimes Audio/Electronics. I'm not sure if that's the kind of ideas you're looking for, but I hope it helps.
My folder is year by year, every bill for that year goes into in order of date( January bills at the front, December bills at the rear ). I have separate folders for the bill of sale, stereo receipts, and miscellaneous. My 1996 TBird has 2 binders as I have owned it for 13 years...
I just sort it by vehicle with a log sheet of work performed, mileage, date, etc.. I dont keep many recipts anymore - only long enough just in case i need to return something soon ( dont wanna know how much I spend on these cars .. ).
I usually own 7-9 cars at a time, and work on customers and family's cars .. so lots of cars to keep track of.
I transferred all of my paperwork to a PC and would keep track of it there until the hard drive failed and I lost my records .. I dont bother with that anymore.
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