The CCU was good for 4th, but with all the options available in 5th it doesn't seem as viable.
If I were going for a cyborg, I'd do 4 cyberlimbs, cybertorso, partial or full cyberskull, cybereyes and ears. I'd make it mandatory that some of the torso capacity be used for nutrition system and waste disposal. I know the skull and torso are described as shells, but their versions in Cyberpunk were the same and that was how they did it for full conversion. With that much modification, it's not far fetched to believe they replace most of your insides too (why I say mando nutrition and waste mods).
This is 6.3- 7.25 Essence, so would require alpha grade minimum. I'd say your Agi and Str are now whatever the limbs are, with the caveat they all need to be customized the same.
However, if you wanted to convert the CCU, I'd keep the price the same (¥250,000). This is close to what 4 limbs, torso, full skull at delta grade would cost. I'd say it acts as a rating 6 nutrition system and waste disposal, with a built in sleep regulator. Downside is it drops you to 0.1 Essence. Upside is you can plug into any drone, and are virtually immune to Toxins and Disease. I wouldn't make all the insanity stuff mandatory, but allow characters to take appropriate Negative Qualities.
Throw in Prototype Transhuman, Cyber Singularity Seeker, and you're the next step in evolution!