Half inch plywood ok for walls?

[Jaybus]

In order to save weight,

Half inch plywood ok for walls?
1/4 inch ok?

I do NOT know what im doing at all.

What we have is 3/4 inch birch.
I wanted something for the sides of my kitchen cabinets that will not be HEAVY,

[Piersg]

Are you going to frame the walls out or just use plywood?

[turf]

the walls on my bus are 1/4" or 3/8" ply. supported by 3 horizontal 2x4s.

everything else is 3/4" plywood.

[slaughridge85]

Check out 7/16" as well, for some reason sometimes its cheaper than both 1/2" or 3/8", and will still provide a nice solid surface

[Jaybus]

For the bedroom the walls are going to be half walls with a beam.

The bathroom yes framed but exposed, single sheet!