In my case, "rolling restoration" usually meant "I have to drive this thing every day." Eventually I bought a humongous cheap old Ford station wag...er, estate. I used it as a sort of covered pickup truck for fetching parts etc.
At the time, I lived near two wonderful junk yards in Los Angeles. Both worked the same way. You paid one U.S. dollar at the gate and brought your own tools. You could then remove any parts you wanted and the yard charged a flat rate for the parts at the exit.
I've spent more weekends than I care to remember in those yards, but it was always interesting. Once I saw two couples roll up in a gigantic old Chrysler convertible with damage to the front fend...wings and grille. The two boys and the two girls found a sedan of the same year in the yard, went to work, and in no time had all the front sheet metal yanked off. They crammed it into their car and drove away, using the trunk...boot and interior to hold their new treasures. I remember thinking I probably would not see many double dates like that one in my lifetime.
Looks like one of the yards is still around:
http://www.pickyourpart.com/