I am guessing more of 6 X 6 or something like that.
Thanks
Cause not going to be that large, but hey close.
Pic






Are you talking about the base under the Self Propelled Gun?
Looks more to be poured concrete than wood.





I have a book about field artillery in the vietnam war.... let me se if it has anything to offer.... I would also imagine PSP might be doable if you could find enough of it. (Pierced Steel Planking, or Marsden Matting)




Sorry but top photo still looks to be poured concrete. No one in a combat situation (IMHO) would go to the trouble to engineer an octagonal wooden fire base. The carpentry required would be unnecessarily complex. But a octagonal form to pour concrete would be a breeze.
We built miles of roads and runways in Vietnam so having the equipment and material to do these concrete pads would be no problem.
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