Dude, with RP2 adding Frames, Tunnel Bores with much more flexibility and functionality can now be created. I had made an attempt porting this mod to 1.25 from 1.1, however I only managed to resolve about 3/4 of the errors recompiling spat out. It will take someone with more experience than me to port this.
Looks like someone is already taking care of this.
I actually registered today (after lurking for quite a while) to share this with you guys.