A bit late, but as promised here comes a short description about assembling the rear hub.
Stub axles were aqua blasted, as it's a mild process some of the surface marks weren't removed, but it was enough for zinc plating. I wanted to mask shaft, but common tapes are not resistant and the place isn't doing any masking so the whole axle was plated. Surprisingly that 10 µm was enough to make the parts not fit together, so used some hydrochloric acid to remove plating from the shaft. It only needed like 5 minutes, but the fumes did mark it here and there. Still came out much nicer then how it looked in the beginning. Next time for machined precision parts like this I might use hot browning / bluing as that doesn't add any appreciable thickness (but less corrosion resistant).
To prepare the hub carrier I've run a 15mm reamer through the bores to clean them up, and also run taps through the bolt holes to remove any remaining blasting media. Lightly cleaned the bearing housing with 320 wet sandpaper and WD40. The bearing (Maserati 397250343) is an SKF BAH-0004 A and for the lock ring nut (Maserati 397250373) used a Ferrari 105137 from Hill Engineering.
To press the bearing (7) into the housing (4) used the outer race of one of the old bearing and ground down so it can slide freely inside. On top of it came the other old bearing.
Installing seeger ring (8)
Packed the front with wheel bearing grease (SKF LGWA 2)
Then put the front dust shield / spacer (2) and the brake plate (3) it's place. I've made a mistake not torquing down the plate, later it's not possible to fit in a wrench because of the hub. The screws are meant to be fixed with Loctite 242 / 243 and torqued to M6 - 12 Nm, M8 - 25 Nm.
To press the axle (1) into the bearing (7) now used the inner race of the old bearing and on top the other one.
Packed the inside with grease and slid on the shim washer (9),
the connecting sleeve (12), which is said to be asymmetrical so I've turned it until it was the easiest to slide down (also used some anti-seize on the splines),
and finally the washer (13).
The ring nut I got is exactly the same as the Maserati part, it's higher by 3mm, but that's not an issue.
It has to be torqued to 300 Nm, then riveted and I've finished up with torque sealer.