I rode one like in the pictures , it was a 96 with MC 2 bar.
Specs where full XTR 950, Judy SL, Crossmax, Thomson seatpost.
I liked it alot but after 6 years of heavy use the frame was dead ...
Too much play in the headset/headtube and the main pivot where there are no bearings but teflon coated bushings on a bronze ring in the frame.
Very light but no good in the Belgian mud .
Nice find , and you only can ride one bike so 2 frames is overkill , even if it's a Klein Mantra ;-)