My ideal Duc would be similar to the new bimota, take the 1000ds engine out to about 1080, free breathing heads, larger oil cooler, all packaged in the lightest possible frame.
Bodywork would have to be a minimal with a monster(ish) tail, lightweight wheels, option of ohlins both ends.
110bhp / 155kg, £6500 without ohlins, £7500 with.
I'll be press-ganging Mr Minoli for a promise tomorrow!
Cheers,
Ali