The Stargate GDO: any dimensions known?

Resurrecting an old thread here in case the OP is watching. Propstore currently has a foam SG1 GDO for sale with a length measurement of 18cm.

I hope you didn't lose interest in this. I think I may have a go at this one myself.

I saw this and thought it was a found object, it looks to me just like a phone (specifically an airplane handset) but according to this article it was manufactured for the show: About The G.D.O. Prop. That article has slightly different dimensions.
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