If you have flat bedrock and build a tower of them up to y 73 you can fit 288 of them in one chunk. On one level you can place 16 coke ovens with one space between them and between 1-73 (73 would be the roof over the last oven) you would have 18 levels that would consist of floor - oven - floor - oven. So for 288 you would need a 16x72x16 area, while for 1152 ovens you would need a 32x72x32 area. Technically the areas would be 15 wide and long, but you'd need spaces which can be placed along the chunk boundaries so you keep the ovens within 15x15 areas.
wouldn't that be ludicrously inefficient, Unnecessary and expensive?