Time to figure out the track layout. Step one; build a foam board “replica” of the IKEA frame I am using. I fixed copy paper to the “baseboard” with pins so I can draw outlines on the paper vs directly on the foam board. That way I can reuse the foam board template over and over. The foam board allows me to fix track sections to the baseboard using pins.
The workable area inside the frame is 21.8 x 21.8mm (≈ 8.3 x 8.3in) with a height of 30mm (≈1.18in).
16M Chassis = 6.6mm
Fine Track = 2mm
Track Base (cork?) = 2mm
Total = 10.6mm (≈0.42in)
Overpass margin: 15mm – 10.6mm = 4.4mm (≈0.16in) headroom.
I am choosing 15mm because its half the height of the 30mm I have to work with. 4mm headroom does not sound like much but in this case it is “plenty”. For the second level I will also have 15mm (0.6in) of available space. If I replace the track base with a bridge foundation I will have 2mm (0.08in) to work with which is 90cm (35in) IRL.
The magnetic wheels allows me to be fairly aggressive with the track grade and I am using that to the fullest in my designs. I came up with 4 options I like. At this point I am not really considering the theme of the layout, just trying to get an interesting track plan. The numbers indicates height of track; 0 = 0mm from ground, +1 = 7.5mm, +2 = 15mm.
Layout option 1: Twice around oval with a circle and an overpass (A), one straight track for a platform/station (B). Simple and straight forward.
Layout option 2: Twice around ovals with a curved overpass (A), two straight tracks for platforms/stations (B), a section of track (C) that require trimming a 60mm straight track. This layout is a bit more challenging, more track, and allows for two stops.
Layout option 3: Twice around squarish loop combined with a circle. Has a curved overpass (A), one straight track for a platform/station (B), one section of trimmed track (C). The overpass can probably be more challenging than it looks.
Layout Option 4: Twice around squarish loop combined with an oval. Has the simplest overpass (A), potentially room for three platforms/stations (B). Will require two more 60mm straight tracks (C) and maybe some shorter trimmed straight track sections in some places. At the moment this is the layout I am leaning towards. Plan would be to keep the tracks from the overpass at 15mm heigh through the straight track to the right (C). That should give me three stops. For a small “go around” layout it is a bit more interesting if you can have multiple stops (with some way overkill automation just for the fun of it).