Well, I've been driving it all around yesterday and today, and while mostly perfect, I'm also detecting a slight "roaring" sound at about 35 mph/1,700 rpm ... so now I'm thinking I must have screwed up the center bearing. The idle vibrating definitely seems to be the exhaust ... so I think I just screwed up everything, which is kind of depressing, because I worked really hard on this.
Of course, I might just be going crazy. So I'm going to take it to my mechanic next week just to get a second, non-crazy set of ears on it.
I'm sure it'll work out OK, even if my indy has to fix it, but I could really use a reason to feel good about myself now ... even the windshield wiper I installed doesn't fit right ... 
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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)
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