If you want to make your life easy, dig near the roof of the nether. If you dig near the roof, you wont have to bridge out over lava lakes
I am taking pre-orders for concrete. My price is 4E per stack (that price will go up once 1.12 is released). Contact me or pm me on the forums if you would like to make an order, or if you would like further information.
1st image: my portal, one example of how to integrate it into your house
2nd image: the normal look of the portals from the ground
3rd image: the normal look of the portals up close
4th image: the hub so far
Another update, twice in the same day! Huge progress has been made.
Image 1: the station at my house
Image 2: cruising along
Image 3: the center of the hub
Images 4, 5, and 6: the user interface
Image 7: the rails
Redstone is not fully wired yet, that's the next step. After that I will build a few more of these on all sides of the central hub and connect some more houses to the system.
But for now, I'm very hot, in real life and on the MV server. The Nether can do that to you.
Recently, I've been working on the design for the hub. There will be a large open area with short tunnels leading to the minecart areas. There will be 4 on the top floor, leading out to 16 bases each. There will be 4 more on the bottom floor, with each leading out to 16 mini-hubs. These are for the farther out bases. In total there will be a capacity for 1088 bases! That is very long term. For now, enjoy the plans for the hub design I created on my private server.
Images 1-3: screenshots
Image 4: what it looks like on a minimap in underground mode