Online sketchup/design tool?

I’m trying to do some rough planning/designing for the monster diorama I’m hoping to build. I’d like to be able to do the initial planning in digital form.

Can anyone suggest an online tool(as I want to be able to work at it at home and on break at work) that can do either a flat design but to specific measurements, or a 3-d modeling tool that is easy to use?

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Google sketchup needs to be downloaded, so that won’t fly on the work computer.

JL Heavenly Hearse for your time.

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