Sounds like not ONE, but TWO worst case engine scenarios. First with the 911. Now the Focus.
No wonder you guys are looking for a way out. I'd step away from the cars, cool off, and perhaps sell some of them to simplify. Give it a month or two before you ditch it all. There are times I get so frustrated with stuff like that, I want to just smash a hammer through the windshield. It's crushing. I get it. Sorry to hear.
EDIT-Just to share. This January, I changed the timing belt on my wife's volvo v60. Several weeks later KABLAM! Broken belt, trashed engine. Turns out an accessory belt got partially shredded, and sucked into the timing belt cover, entangling in the timing belt, jumping the timing. I couldn't even bare to look at the engine, I just handed it over to a trusted mechanic to pull the head and fix the valves. I was sick to my stomach. I needed a freakin' shrink afterwards "YOU DID NOTHING WRONG" the mechanic told me over and over, as this is a known failure on this engine. I felt like Clark Griswold trying to turn on his Christmas lights in Christmas Vacation "But I checked all the bulbs"
Still so mad, shooken, I couldn't look at it. In the end, it also caused a hairline crack in a cam housing, so the engine was leaking oil. The mechanic himself had to pull the head/timing THREE times to find the microcrack that was causing it. All warranty work. Not only did I get bit, it bit him too. He sent me the piece because he was so proud he finally found the crack. It took me 15 minutes of looking with dental loupes to find it myself. I took a wad of $100 bills out of my wallet and handed them over and apologized for the headache. 5 months later, and I am still just getting the courage to even look at the car, let alone work on it. Time heals all- maybe, but not quite yet!