About making a Minecraft Sword Prop?

I’m gonna make a Minecraft wooden sword prop but i don’t know what measurements i should use. My plan is to cut wood cubes and some different ones and put them together to make the sword in the attached picture. 

Does anyone have any recommendations on what measurements i should use. Preferably one measured for the cubes, and then one for each different shape. 

Update:

also recommendations on light weights. it sturdy woods is helpfully to. :)

Update 2:

i messed up the last update i meant recommendations on light weight but sturdy woods please

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