How Do I know What Size I Should Use In Google Skecth UP?

[Alphadin]

          How Do I know What Size I Shoulde Use In Google Skecth UP?
I Made This But Think It Might Be Huge If It Were An Add-on.
Btw The Temp I Used Was Inches. Also I Searched And Nothing, IF You DO Find It, I Used Wrong Keywords.

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[Crysist]

Blockland Reference Hand for Sketchup

By Pandan