I wanted to make sure I did not do something unheard of (my husband thinks I am crazy). I did not have a sheet cake pan so I made a 16"x16" cake and a 9"x9" cake and then pieced them together and ended up with a 16"x19" cake. Is this okay or should I have went out and bought a pan? I know I eventually will invest in more pans, but I did not have time to run to the Hobby Lobby to get one at the moment. The cake turned out fine because the icing hid the fact that it was created from different cakes. I want to make sure I did not cross an unofficial rule of cake decorating!
As long as you iced in beween the cracks really good, there should be no problem. Sometimes they crack during transport if you do not ice them together.
KT cakes, I've been professionally doing sculpted, cut-outs, and every kind of cake imaginable for 30 years and always have to cut and patch. There is no rule against it. This past weekend I had a 14" round marble bottom on a wedding cake ,7-10-14. I use 3 layers in each tier and one of the layers came out of the oven with a big cave in. It seems that the oven thermometer fell in ! So after it was cool, I took a round cutter, cut a circle from a spare 6" layer I had, cut the same size circle from the 14" and swapped out cake, so the 14" was whole again! As mentioned above, always put b.c. around it to hold it in and you are good to go.
Ramona
I have done that before without any problems. I don't have the room to store many pans.
I think you did the smart thing, wouldn't have thought of it myself! Sometimes I have to use cake scraps to fill in holes that might have torn out of one of my cakes... SHHHHHH don't tell anyone! Our work is ART and sometimes we have to just wing it, so good for you!
Absolutely nothing wrong with it as far as I'm concerned, have a look in some cake books, particularly for odd shapes, when they show you how to cut them out, you have to piece them back together. Tell your husband you are not mad!!! Creativity is the key in this business! I have to do a 60cm (23.5 inch) star in the next month, I obviously don't have an oven or pan that big!
So just go for it, icing hides a multitude of sins, and once people start cutting there's hardly anyway to tell it wasn't one cake.
HTH 
I've done it with sheet cakes, the only sheet I have is a 9x13. I've had a couple orders for larger sheets so I just piece it together, the tow truck cakes in my pictures are a half sheet and a full sheet pieced from the smaller cakes. Unless you have a very large oven you can't make the largest sheet sold in grocery bakeries in one piece.
You should show your husband the 18" half round, designed for people baking in standard ovens. Also look at the X's and O's wedding cake in the 2007 yearbook, they used three 12x18 sheets for the bottom tier and they're the professionals.
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