I'm In the midst of redoing our bedroom. We have a small closet so I originally had gone down the path of getting one of those kits from HD/Lowes. But after reading all the reviews I determined it will just be easier to build it my self.

If you want it colored other then white you will have to go to a cabinet shop supplier/ mom and pop lumber yard. Melamine kind of sucks because the veneer flakes off unless you have a zero clearance track saw or you use a circular saw and lay down painters tape on the cut. You also have to edge band it

I decided since im spraying all the trim anyway that I would just do Birch Plywood with a small faceframe and paint it. For the drawers you can get the boxes and fronts premade from https://www.barkerdoor.com/

For the shelf pins you can do [Link: homedepot.com]

Closets are nothing more then "exploded" cabinets!