I am envisioning (2) 12" round, bottom cakes as my base. Then I would like to stack (4) 8" round cakes on top of that. Now, my questions are as follows:
1. Is this even possible?
2. Would I put a cake board between the double 8" cakes?
3. Would using the dowel "system" inserted in the 12" be sufficient?
4. Would I also use dowels in the bottom layer of the 8" stack?

Am I explaining myself in a way that is understandable?
I am a little A D D and get distracted by the smaller issues instead of the big ones that will cause me problems. Oh.. look at the pretty butterfly... LOL

TYIA for any help!!!

Yes, it would work.

Dowels in the 12" tier, dowels in the bottom 8" tier, cake boards under both 8" tiers.

Basically you would be making a three-tier cake but the top tiers would be the same size, if it helps to think of it that way.