While there are snaps for Do It Yourshelf clutters, many of them are too large for the DIY spaces in MK. Some DIY clutter has been created specifically for MK that better fits. More will come in the future.
The stove requires a step platform snapped to the front so that NPC's are not floating when using the stove. If the stove is snapped into a prefab piece or is on top of a platform piece then use the dual step. If the stove is built directly on the ground use the single step.