I dont see why not....I have made a full sheet by combining 4 1/4 sheets before. It looked fine.... I am sure you can do it!
I'm doing that right now! I just baked 4 12 x 18s, torted them and crumb coated them. They are in the freezer separatelyand will be put together next week as a full sheet bottom tier of a 5 tier stacked wedding cake. If it works for half-round pans, I don't see why it wouldn't work for this. (I hope!!!!!!)
My airport cake (in my photos) was 5 quarter sheet cakes put together and that worked fine.
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