I used the BAF as the main base, cut the figure just below the knee & just above the articulation point on the thigh.
I cut & sculpted on the knees that were used from the previous custom I made, not the easiest process as I had to measure the length to make sure the legs weren't too disproportionate.
Repainted the figure to highlight the details & be accurate to his look in the comics as his fins & lips were yellow in the comics I've seen of him from the 70s-90s.