change form field when signed

So I want to have a script that changes the size and orientation of a signature block when signed. For example I have columns a-g and "g" has it's own A-F. Now if I fill out a1-gA1, I would add a signature on gA2 to close out this transaction. But I want the signature block to automagically orientate itself vertically and change the size to the remaining blocks in column gA. So if I sign on gA2 it will fill gA2-gA16. If I later sign on gB4, it will fill gB4-gB16 and so on respectively. Is there a script that could be written into the document to accommodate this? If you would like to view a sample form to go by Google DA Form 2062.