Why convert? Will you be running a game?
I do it in part as a math and mental exercise. I want to see how characters/creatures and their tropes would change in approximating their values in a different system. Then use the destination game system and see how it stands up. Sometimes it "feels" right either in conversion. Other times, not so much.
My current project is converting FTL: 2448 to d20, since there is a d20 version of Fringeworthy and Bureau 13, then the lot to Cepheus Engine. Why? Because mushy Mellors are funny fellers...