I'm going to make a multideck myself. 4 layers (1 staging) with a helix on both ends. It's all in the benchwork arrrrgh.. I'm to one day expand the second deck out from the main area of the layout. I have a 14'x5' space to work in currently. Reach will only let me use about 3 feet of sceniked area. I can perhaps extend that a bit but I'm modeling the Big Sandy river valley so it's pretty mountainous.
1 hidden staging well unseen of course for the most part.
Op Level 1. Main working yard and river front + big city terminal railroading
Op Level 2. Main mountain running 2 - 3 towns + expansion to more layout (hopefully)
Op Level 3. Coal operations 2 working coal mines to switch out.
Helix at both ends from staging to level 1 (representing an adjacent subdivision as it passes over the Big Sandy. Then continuing the helix up to level 2 from level 1 at the West end of Russell area. Then at the now south end of layout a spur line (helix) to two mines on the third deck.
I wish I could use the closet the sits right beside where the main helix will go but we all know what the women in our lives would say.. Been there got the T-Shirt

. Building a helix in a closet does have it's downside too if you'll pardon the pun
I figure the helix will take up 40 inches on the one end (the other end is hidden) so no worries. That will leave me with 11'x5' rapping around the corner about 2'-3'. The Spur line will originate and terminate at the second level so no need to run trains back through to get to the helix up to the mine area.
I think one of the keys to make a multi-level work is to have very different scenery on each one. You have to continue to a degree (for continuity) but with quite varying scenery you don't get the impression it's one long elevator ride between levels.. The rail is actually going somewhere
The helix will decide where the levels will be placed. Rotations x Grade. The helix has to have an entrance and exit so those points are where the level will reside. I will adjust up or down to get the levels where it's best for eyes to see and hands to work. Trains will be quite a bit shorter then today's monsters (15-20) cars as I'm modeling the late 50's. So I'm hoping to hide the entire trains inside the helix when moving from level to level. Depending on the length of the helix I can make trains shorter or longer (hopefully longer perhaps). Time dust off the calculator
I've got an good idea of what I want. Track charts/Topos' for the area. I've modeled it a bit in Blender (3d modeling program). Don't have a completed track plan as yet but I'm close. Then it's getting the materials up the stairs and building..
I wish you luck with your re-model. Be sure to keep us updated
