I’ve been struggling to figure out what to do about getting to and from upper levels. That is why the section in the upper left corner of the plan (that nobody ever sees in the photos) is still undeveloped. Originally in my N Scale plan there was supposed to be a helix there, but now with H0 that helix is a bit bigger and that tipped off the scale for me, even though N scale helix was almost as big, square footage wise.
The helix for H0 is going to be a really modest one, barely adequate by any standard. A 24″ inner loop and 26.5″ outer, with an average grade of 2.3%. I wish that grade was 2% or less but there’s just no room to make it an oval or make it a bigger circle without sacrificing aisle and benchwork space. I might see if there’s some room for a triangle but knowing that I need a 24″ turn curve that might be out of question.
Another option is a gradual around the wall climb, a no-lix. Problem with that is I would either have to give up the walk-in aspect of the layout and put a swing gate at the entrance, or make trains turn back and go through the same scenery twice, on a different track. Either methods use more precious benchwork space all around the layout, unlike the helix which hogs the corner with its 20 sq. ft.