I'm currently building a new HO layout but plan to put the O gauge under neath it. What would you recommend? On floor or shelf under layout or other? Any pictures of how others are doing it?
The HO layout is 40" in height but scenery in mountain areas might be as low as 30".
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Too much dirt down on the floor, if its a foot above the floor or more that would be a lot better and still could view it
Dennis,
Any pictures?
John, how’d this wrk out for you. I’m in the midst of building a medium sized gauge layout and have just been offered a nice completed HO set up
I made a loop to loop 0 gauge subway by making a subroadbed then assembling the main platform with legs in the pre designated voids of the subway. The subway level is in flat black. It has three subway station platforms and two bridges over a deeper valley:
Floating subroadbed clamped in place
Checking for clearances
Temporary piers in place
Trestle piers to finish valley. Note exposed subway in background.
Track forward of station platform
Track behind platform and in front of platform along with siding nearest fascia.
Track beyond station platform
In addition to a large o gauge layout at 40" off the floor, I did an HO three leaf clover layout 20 inches off the floor with a dual track mainline and each main having a siding. Each leaf protruded from beneath the o gauge pike.
I had Leon of Dallee electronics install automatic circuitry so four trains could automatically rotate through a varying sequence of passing through the three exposed lobes of the clover. The children loved it cause it was at their level. No photos.
I know this is a very old thread and long past the point where responses may be useful!!!
But anyone contemplating above and below layouts should check out the layouts of Jim and Linda Quick. Linda built a beautiful layout under Jim's. I believe it's about halfway between the main layout and the floor.
There is an OGR video on their layouts and articles in the OGR magazine archives.
Of course, in responding to the original post, most people on the OGR forum would think the O gauge belongs on top and the HO below. 
Jim
@Don Baird posted:John, how’d this wrk out for you. I’m in the midst of building a medium sized gauge layout and have just been offered a nice completed HO set up
Still working on the HO layout. Need to finish enough of it to have room for the O Gauge.
John
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