When I was young, Hinchliffe released a set of Barsoom miniatures – They were not great, and so they redigned them almost immediately. They weren’t a great improvement. Then Heritage released theirs – About as good. Soon, none of these were available, and we were left to our own devices.
With no better options, I got in the habit of converting warriors for Barsoom, and even though there are now some lovely figures available, I still occasionally do conversions. Naked figures or those in loincloths work well with hair and weapons added.

These were Pulp Figures Zulus. Now they are generic Red Warriors.
Harness/belts are made from putty or paper. Hair is putty.

Swords are from floral wire curved and hammered flat – Handles are left unflattened, and shaped to form a guard. Many have extra wire added to the guard.
They were a fun conversion, but either my skills have deteriorated, or my eyes have. But at age 70 I have finally found a skin tone I like for my red Martians.