I wish I had done a trial run first as I could have done a few things different from the start. Firstly I had them stay at the firestation, then smacked myself in the head as I realised I had enough simoleans to buy them the best beds on the lot, plus toilet cubicles and showers. This was for the SV part as once I went abroad I bought lots of shower in a can and high quality food.
I must admit I did not think of the loner and slob trait. Well, I thought of loner, but I thought that they might get the negative moodlet just by being together in the group of four. However I did work on them getting happiness points without taking up any extra time so that I could buy them them some rewards like steel bladder and jetsetter for one. I also found over-emotional a good trait too.
Although I didn't get a great score there was one trick that I found worked well, which was to coordinate them all so that I didn't waste time flicking between them all to find out if one of them has finished the upgrade. So I would get them all to upgrade the same location together so I could see exactly when one would finish, then pause the game and transport them to the next upgrade. I found if I didn't keep an eye on them and one finished the upgrade, and queued up an indendent action I wasted time having to stop that action, transport them back to where they were, and to queue another upgrade.