I do not have too much space 

Whatever space I can use, I would need to clear it out and use it only when I am working on my model.

Hence, I am considering going to N size

I was considering the following

- Design in modular size (e.g. 2 x 4, 3 x 5 or 3 x 6)

- Have the ability to place these modules side by side

- Should have the ability to join tracks and electricals and sceneries and backdrops quickly

I'm trying to plan a 3-layer HO layout (two levels plus staging). Keeping deck thickness becomes critical, so I've been looking at a metal support systems like Randy used. Not wanting to divert his blog thread beyond asking him about what he did, I started a new one to ask my questions.

I have a solution for my problem!

Here's my original post:
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Most likely, once retired, I'll be moving. It's 5 to 7 years out, so I really do not want to postpone building this layout.  The new house will be a custom build, so I can fit existing modules in the new house. Modules are built, no trackwork yet.

I'm wondering how to attach wood to our poured concrete basement wall to support a layout and backdrop. Will construction adhesive work on painted concrete? Son-in-law suggests anchors propelled into the concrete with a .22 shell, but doesn't that require a gun permit to use/buy shells. Any ideas would be appreciated.

Thanks, John