My kitchen cabinet installer who ordered my cabinets had to be replaced, by me! He was going to build a utility cabinet (36" width, 90" height) to house my 36" microwave, 36" oven and 36" warmer with a 18" height cabinet on top. He did not order a prefabed cabinet because he said it would be easier to construct the cabinet and make everthing fit. He did order the side panels and fillers to finish the cabinet from the outside.

I need somebody to help me by giving me some idea on how to get started.