I have a bride who has requested this cake for her wedding.  When looking at it I am having trouble figuring out if the textured cake is a standard 4" high or if it is a double barrel

does not appear to be double barrel

and the smooth cake 2 inches high. yes

But if it is a double barrel I would think that would look off.  I'm just having trouble wrapping my head around it. 

This wedding is expecting 240 guests at the reception.  I am doing a grooms cake to go along with the bridal cake.  I was thinking of doing a 12 inch square (78 servings).  They want a Minecraft cake that says "she said yes" and it will have a topper on it as well.  The bride also wants to save the top tier for their first year annavsary.  Normally I would make them one but they live out of state and are only coming here for the wedding.  I'm explaining all of this because with the two different size cakes I'm not sure how to figure my cake sizes needed to feed all of these people. 

not serving 6 inch

8 inch 2X2X2 12 serving

10 inch 1x2x4 38 servings

12 inch 2X2X2 28 servings

14 inch 1x2x4 78 servings

156 servings

Also how do you serve these cakes when they are two different heights?

I would serving the 2 inch high at 2x2x2

Any and all help would be greatly appreciated!