I don't know what the situation is that is causing you to consider rebuilding..
but if it were me I would get a can or two of Trans-X and follow the directions... and start saving up for a rebuild from a Known rebuilder...
From other MB stuff I think they went out of their way to make stuff require special shop tools... I guess they make big bucks stocking the dealerships with those tools... or don't want to encourage DIY naturally...
Ok, just read pawoSD comment.. agree completely...