Only 15 during the clonewars, Ferox is a smart and motivated young man, with no ability with the force what so ever.
He hooked up a blue Kyhber crystal he found to a core built in his chest that keeps his heart from failing from all the radiation left behind. His physical might is increased drastically as well as his strength, thought process, healing, and metabolism.
He finds 5 Kyhber crystals in total, which he combines together in his core.
In an encounter with a Jedi who was also collecting the remaints of his brethen, he loses 1 arm and both of his legs. The Khyber crystal allowed him to survive when by all rights he should be dead.
He crawls back home where he attaches the modified legs of a battle droid and manages to hook it up to his nervous system after a few days of work. They are hooked up to his reactor as well through some of the wires running throughout his body. He also has to use one of his spare droid arms he found a few days earlier on the battlefield.
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He didn't have anything that could substitute for his missing left eye so he covered it with an eye patch.
Years go by and he buys a home on the outskirts of a large village. He builds an underground labatory where he learns by taking apart droids and corpses, even bringing a recently dead back from back to as a cyborg.
He found many intact clone trooper bodies of which he copied the genetic blueprint.
He improves on his droid limbs, giving them Armor plating and making them thicker and stronger.
Stormtroopers razed the city when he was 19, where the upper part of his house was burned down with him in it, he was able to escape but lost his hair in the process.
He wears a mismatch suit of Clone armour, customary garbs, and some of the black suit that Soldiers where under their armour.
His body had grown so strong that his skin could take a few blaster shots before they even go through, he could even recover from minor heart and vital organ injuries
He rebuilds his house after the stormtroopers leave, scavenging the ruins of the city and finding 5 relatively intact ships, which he promptly takes apart, learns a bit, and creates a new ship.
And thus the Cyborg sets of into space.