I have been following this and I can imagine ..... I will to do this with the 190 for the heater core soon.
Not many people can do something like this .... let alone actually try and tackle it. Be sure to take the obligatory picture of the dash gutted .... to be an impressive picture.
Hang in there. It sounds like you are taking the right approach with bagging and identifying everything.
Keep us posted!
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)