So finally some progress!
It took a long time but, in the end, I found a pair of NOS Ritchey Megabite Zmax WCS in 2.1 in Scotland

. I also found most of the rest of the parts and last weekend went to mainland Spain and had time to work on the bike:
I laced the wheels (Mavic 117 SUP Ceramics 36h, DT spokes, M900 hubs),
I fit the tyres,
73mm BB and M900 crankset,
Rear derailleur M900.
M2 fork (a different one; I dismounted it and the rubbers were in ok condition so I did not change them),
A-TAC stem with rise,
I fit and set the Maguras, which was not very easy and, since the brake shoes are new, the wheels had to be very true as there is not much room in there...
Ringle Ti 3DV seat QR (I have a pic where it was used)
Grip Shift SRT500 8sp
I disassembled, cleant, and reassembled the rear suspension: In a previous post I showed how the original red elastomers were "melt" so these are the next steps:
Outer legs without dust seal and bushing:
Dust seal and bushing:
Disassembled inner leg on the left and "as it came" on the right:
Inner leg with new elastomers and grease ready to be re-fit:
During chaos at my mom´s home :roll:

:
And almost done: