Nice result Jeanette. Well done. Your acquisition technique reminds me of CCD drift scanning using the TDI functionality. You don't need an accurate mount (a rock or chair would do), simply let the object drift across the chip.
There is some good info on drift scanning available;
http://www.driftscan.com/index.htm
http://www.astrosurf.com/audine/English/result/scan.htm
http://www.sbig.com/pdffiles/drftscan.pdf