Ok i've watched all your perplexing and nightmare replays now.
Here are ones that were very interesting to me:
Please send down a rope: I didn't think about doing close-stacking bridges to turn them around while making the map. So your solution is a fine alternate.
Sending our love down the well: Interesting total backroute, Nice one. I'll have to fix the map later.
It doe____snt seem to fit: Quite the different approach, yet still the use of tunneling under the seabed was needed. A very good alternate route, good stuff.