Workflow / Signatures / Approve

So, I've been out of the Acro JavaScript loop for a while, but my new role is bringing back to this. Any guidance is appreciated.

I have a form that can have up to five different signatures. (completed by, reviewed by, manager one, manager two, senior manager). The form must have completed by/reviewed by signed. However, either of those could be a manager as well. If neither are, then a manager must sign.

All that's well and good, but when the form is signed, it needs to move down the workflow until its final submission (likely in SharePoint).

Each signature along the way will must be allowed to add to other fields on the form.

My though pattern is to email the form as FDF. Problem is that doc.mailForm() doesn't retain the signature.

Can someone point me in the right direction? Essentially, my final flow should be something that accomplishes this:

1. Completed by completes form and signs. Then sends for review.
2. Reviewed by reviews the document, comments on previous comments (held in text fields), and signs.
3. Manager 1: Same or if Manager 1 is one of these two, then ignore and move down the line.
4. Manager 2: Same or if Manager 2 is one of these two. Then, submit form.

The data will then be compiled into an Excel file for reporting. About sixty branches will submit this monthly.

It's been a few years since I've been coding these, and, as I said, I'm just trying to get my feet wet again (in the deep end, of course).

Thanks.