Open baffle dimensions for Phillips 9710 ?

Hello all, i've a second pair of 9710 Phillips, and i would like to try them in an open baffle design.
Someone has tried them in this way? what are the dimensions that i can try to start with?
Ny pictures and experiences?
Here a picture of my actual speakers, with wool inside, driven by a full recapped Grundig NF20, sounds nice.
thanks!
 

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