Wooden board on bottom attached to PVC center support, dummies in the middle then another wooden board attached to the top of the PVC to support the top cake. Just my guess!
It could be done...good dowelling, make sure the top is centered, no biggie. But I wouldn't do it without a center pipe to hold the whole thing in line! I also vote for the center rounds being styrofoam, though.
With the pipe going through the top section or resting under it?
It occurred to me that the top tiers could very well be dummies. 3 tiers is a bit of weight to balance precariously like that.
No, I doubt three tiers are balancing precariously on the top of a pipe. I'd guess a center pipe is used throughout. As each supported tier is slid down the pipe, additional stops can be attached to the pipe to prevent excessive weight and bulging on the lower tiers.
Another possiblility is the center rounds are styro dummies. Then only support needed would be in the tiers below the rounds.
Most likely, the round separator/spacer is styrofoam.
The three tiers above the round would most definitely require supports, unless you're referring to the possibility that the upper three tiers might be dummies too.
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