Microwave and Oven upper cabinets will two doors and around one shelf per 16" of height. The depth is 24" to fit the appliances depths. These particular cabinets have MDF doors with shapered edges.
Height is either 31 3/4", 60.71" or 17.875" . The oven drawer base is 12 7/8" tall sitting on 4" tall legs to fit under an oven that usually is around 52" tall using the 17.875" tall oven cabinet upper.
MDF, Medium Density Fiberboard is the carcass material of choice due to the stiffness, uniform thickness, durability, and the lack of internal voids. Plywood is too unstable, is less stiff, and has internal voids that can cause problems with modern European hardware.
The upper cabinets have solid tops and the oven cabinet base has an open top with spreaders but front trim will cover a couple of 2 x 6's that carry the weight of the oven and closes in the top of the cabinet.
The backs are 3/16" thick, inserted in grooves around the bottom and sides of the uppers and planted on the back of the cabinet and secured with staples all around the perimeter of the cabinet. Backs hold the cabinets square and provide strength as well as protecting the back wall.
The oven base cabinet stands on ABS feet or legs, consisting of a socket that is attached to the deck of the cabinet and a leg that is tapped in during installation. Each leg can handle about 300# of weight bearing directly down plus it is screwed to a wall in most cases. That is 1200# per cabinet plus the weight the back screws can carry, nearly a ton of weight could be supported on each cabinet. Plus additional support added by the toe kick and end panels.
These are stock cabinets and available in standard sizes only. For custom sizes you must go with more expensive custom cabinets which we also manufacture.
There are soft maple five part door cabinets available. The product number is MOCKC-SM.