Found a man on a site giving floorboards for free, who then kindly agreed to deliver to me.
Then I hammered and sawed and cut down the stack,
Then attached them with screws at the sides and the back.
Next the foreman insisted on checking them all to be sure they would work and not crumble and fall.
Pleased with my craft he allowed me to varnish then stack on the books and repeat until finished.
Now they stand in our lounge, a spectacular pair, with our books in one place for the whole house to share.