sounds like standard 916- plates are semi sintered and the centre is anodised alloy
plates are 3mm thick when new and SP fully sintered ones are 2.5mm

From the Haynes Manual:
748, 916, 996:
7 friction plates - one curved plate with two friction surfaces
Minimum friction plate thickness = 2.8 mm, wear =0.2 X 7 = 1.4 mm, no adjustment
2.0 mm plain plate #1
2.0 mm*plain plate #2
3.0 mm friction plate #1
1.5 mm dished plain plate (convex side facing toward you)
3.0 mm friction plate #2
2.0 mm*plain plate #3
3.0 mm friction plate #3
2.0 mm plain plate #4
3.0 mm friction plate #4
2.0 mm*plain plate #5
3.0 mm friction plate #5
2.0 mm plain plate #6
3.0 mm friction plate #6
2.0 mm plain plate #7
3.0 mm friction plate #7
2.0 mm plain plate #8
pressure plate (line up marks)
38.5 mm Total

Bit of a mishmash of parts there SP? You say the center hub is alloy.

A picture saves a thousand words, or something like that.

Plates

16 plates in the correct order according to Shazaam and the Ducati workshop manual.

Those friction plates are absolutely mullered !!
and the plain steels look blued as well

I would say that its been run with an open clutch cover and some sand or such like has got in there. I've never seen a clutch worn out like that one is!! You can tell its not done many miles by the lack of damage to the tangs.

rider error

Possibly Glyn, looking at the tangs on the friction plates they are blue. Must have been some serious heat in there to do that.