Afetr having been unceremoniously dumped on the ground by a myopic car driver, I had a fibreglass 998 style 'race' fairing fitted to my 748 (2 x 1-piece side panels, & full belly pan): No significant modification required (from memory), & your original fairings can be safely kept in the garage. Will smell of fibreglass for the first few outings, but they have lasted 18 months without any problems.
You need to get up close & personal to see that they are not original Ducati fairings...... well worth a look if you are not worried about keeping the 'exact' original appearance.
And, if memory serves, Tony at Two Four Performance (previously Two Four Italia), said that the race fairings were also available in 748 pattern with the full belly pan........
http://www.two-four-italia.co.uk/