I was about to pose the question of how you would make more lava if you used the one lava bucket to make a cobblestone generator (machine). Looks like you beat me to it.
I think I put the one lava in a fluid transposer, then ran that lava over Brick (from clay in a furnace) to make individual Nether Brick (250mb of lava each). From there, make the Nether Bricks, and ResGen to make a Magma Crucible.