Ficus carica can make a nice larger-scale bonsai. However, the leaves will only reduce by so much, and most specimens are photographed after a good leaf pruning, so that the new leaves will grow somewhat smaller in scale. The figs (fruit) will not reduce in size.
The really gnarly-looking trunks are made by doing a severe trunk-chop, and growing out, and training, new, sprouting branches...then chopping them back also. It's a work in progress, and best results come from in-ground trees grown in a training bed until they look like something you'd display. Then reduce the roots until the tree(s) will fit in a display pot. Then you can refine the overall design. Standard bonsai techniques should be followed, like root-pruning, feeding with correct fertilizers, and wiring branches into desired positions.
Good luck...post photos from the beginning of this process.
Frank