shared crafting of a Homunculus

[VRMH]

The Homunculus' description has this little titbit:

Quote:

it is possible for one person to give blood for the creation, another to sculpt the base material, and another to magically animate it

So how does that work?

• Can one character have required feat, and another roll the skill check?
• If so, what happens when the DC is increased to gain speed or cover a lack of requirements?
• Would they both need to be present and actively work on their shared creation for the whole duration of the process?