I put one in an attic once... But it was a rare situation.

It had the headroom and workspace and access.... And it rarely ever breaks 80F here.... [Linked Image] There were also two AC units in there too, doubt they ever get used.....

As far as getting neutrals mixed up, band them together with thier conductors with tape, or number them with thier circuit numbers. Number books are cheap.... Tape is real cheap!

Almost Fried, I have done simular things with using an old panel as a junction box and leaving the nuetral bar and grounds, but only under 2' ands in a large nipple so it fell under the 2' rule for derating. You might be able to go a further distance in a gutter... But not 2 conduits. (Magic number is 9 or it is a waste of copper to up-size IMO) And I don't think I would ever MAKE a neutral bar.

Mark Heller
"Well - I oughta....." -Jackie Gleason