What are the odds of it reoccurring? About 15% according to latest studies
Could it occur again with milder severity at 20weeks and not be picked up? Yes, DD only had all of her small and most of large intestine out, which is considered small. But, it can as small as only a few inches of bowel out.
Does the timing of finding anything alter the care you and bub would need? Immediately after finding out I'd need constant care at RWH, whether that be at 16 or 36 weeks.
Would you prefer to have a scan at 16, 20, 24 weeks? Yes, I'd rather have a few scans to confirm that there's something/nothing there. Rather than go all the way to Melbourne and be traumatised by the doctors there.
If you think they're competent enough where you are, I'd probably avoid the stress of traveling to a place you find traumatic. One of the problems with more scans is that more little things can be picked up which usually resolve themselves but can cause undue stress. One benefit can be peace of mind and being able to make decisions earlier. No decisions would really be made, I'd have to go to Melbourne for my care. No matter what kind of problem bubs has (praying he's healthy), whether that be Gastroschisis, or something fatal, I'd carry my child as long as I could. Every living person has the right to live and die as their body chooses.

One option may be to be referred to a different Melbourne tertiary hospital - so Mercy or Monash instead of RWH. Yes, we'd probably be looking at the Mercy or going to Adelaide, as that's also 500kms away, so no travel difference.

Thanks so much, you're always so level headed.
And thanks, MummaBee.

I'm going to have a talk to OB2, whenever I see him.
I'm still interesting in what others would do.