Advice for situating computer desk under shelf layout - Model Railroader Magazine

I just measured my shelf over my computor. It's at 56". The shelf is not for trains, it's for more computor stuff. It seems to have plenty of air space above the monitor.
It will count on the height of your desk and monitor and add at least 6 inches for air space so that the heat from monitor can escape.
I also have my computor in the same room that I intend to make my layout. I thought about going over my computor area, but just once. I decited it was a bad idea. The track would be too high verses all the other track layout. I intend to have my track height at about 34 inches, so it would be quite a clime for any of my engines (all old time 4-4-0's) and I have a 20' x 20' room for my computor and layout.
Even if you can over come some of the height problems, do you have to go around any corners, switchbacks to get back down to your normal track height?
As far as mounting brackets to the wall. What is your basement wall made of ? Painted Brick or concrete, 2 by framing with drywall or plaster?
The thing is most walls have studs every 16 inches, so that is what I would use except over the computor desk. There I would use a piece of plywood or 2 by - depending on the span assuming that you don't want to have a bracket right over the desk and monitor.
I hope this helps a little or in some way.
ennout