My friend wants me to make a Lego cake for her son's birthday party. She wants a tiered look but only a 4", 6" & 8".  I'm unsure of how to post a picture or I would post the one she wants. With the small cake size, wouldn't that be terribly small? I've never done a cake that small before. Any suggestions? She just wants the typical Lego block looking cakes, but on top of each other. She thinks by the smaller size it will be easier on me. 

Thanks!

How many servings are needed?

You've got to find out how many people she wants it to feed and you tell HER how many tiers she'll need. If no tiers are necessary, then maybe do a dummy cake to add the height she wants.

Around 50 people.

Then you can do a couple combinations: 6" & 9", 6" & 8", 7" & 8", (assuming they are square?) and if she wants a third tier, then do a dummy cake of the next size up or the next size down.