As a 15 year MB tech, and someone who both owns this case as well as seen inside it, the chances of rebuilding this case without the MB special tools is virtually 0. There is a seal that has major positive rake, that is installed past very sharp shoulders, deep inside the case, where access is EXTREMELY limited. Myself and several other exceedingly qualified techs have attempted to replace that seal without damaging it, to my knowledge nobody has succeeded without the tools, for which MB wants a few K $$$$

If I can ever get my hands on another case core, I may use my lathe to attempt to make my own seal installation tools.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff