The location at the moment is on the border of Terra, so... very far away. I do however have rails running around 1500 blocks closer to the spawn to the site. The basic idea at the moment is a 100x100 or 200x200 square in the middle of the ocean that will run straight down to bedrock. The city will then be built in multiple layers from the bottom to the top with multiple railways and levels for living areas (e.g. slums being bottom level or bedrock).
The building process would run like this:
- Step 1. Strip mining to extract all minerals (only on the levels with diamonds) underneath the future build site.
- Step 2 TnT blast down to bedrock after walling off the ocean so as not to enter.
- Step 3 begin layout from bottom to top and come to an agreement amongst the founders. e.g. roads, buildings, lighting and the material selection they will be made from.
- Step 4 would be finishing up the surrounding areas outside of the build site which would for the most part, creating ocean where there previously was none.