I'm coming up with a Macguffin for a campaign, which is the bioware equivalent of a skillwire. The way I see it, high-level corpers love bioware because it's expensive and not as obvious, and would want something like a skillwire without getting cybered. (It IS a lot of Essence) So, in step Innatech (made up corp), with the Skillworm! I thought a symbiont would be a good idea, but I don't understand the difference between Leech Ectosymbionts and Endosymbionts. I'm guessing the latter is internal while leeches are external?
So here's what I'm asking for. A bit of fluff on how it works, or where it would be implanted. I'm thinking it should only be available for individual skills, so you'd have a Pistols Skillworm, or a Con Skillworm. I'm just not sure what rating you should get the skill at. I was also thinking Prices, Availability and Essence Costs of 50,000¥, 24 and 0.5, respectively.
Any thoughts would be appreciated.