text.dat - possible to split ansi top and bottom lines from MsgSubj and MsgDate?

I'm trying to shuffle around the order of the subject, from, to, etc., in the message header, but it appears the top and bottom graphic lines surrounding the headers are tied to the Subject and Date lines.

I started trying to work on text.dat, and then exec/load/text.js to add in text lines for the top and bottom graphic header lines, but I think there's more to the picture than what I'm seeing (hardcoded items elsewhere, I guess)?