141 is different, in regards to checklists, and anything published.. when you're in a 141 program, it's much like 121, in that if it's a checklist used for the airplane, it has to be 'approved' or accepted by the faa, since any change in the checklist can be considered a change in curriculum, and any change in curriculum has to be approved through the faa.
i was also adominished lightly on my cfi checkride. i had typed up my own checklist, as others above had stated, adding a few things here and there. the whole ride went good, until the inspector noticed me sliding my 'unofficial-looking' checklist back in my flight bag. he asked to look at it, asked if it was from the poh, or manufacturer, etc.. when i told him no, i typed it up myself and added some things i regularly forget that aren't listed on the poh's checklist, a look of disappointment covered his face.. he still passed me, but explained that, in his opinion, the only way my personal checklist should be used is in conjunction with the poh.. what he was getting at was, i should have had the poh out, or at least the provided checklist, use that one, and then i could use my personal checklist.. yes, he was saying to run two checklists, even though mine had all the manufacturer's items included...
he may have been wrong, but his badge said FAA, so i listened to him. later, as an instructor at a part 61 school, when we retyped any checklists for our airplanes, i always made a trip to the fsdo, to see this particular inspector personally, to have him 'approve' them.. and he did so.. read over them, cross referenced them to the poh or afm's i brought with, and he put a little red stamp on the back of each checklist.