I built an EM cabinet out of 1/2” Birch plywood, one side paintable, used Birch for Back Box trim, and and 3/8” plywood for bottom, paint and glue. All total about $100 Material. Figure it took me about 8 hours, cut material, glue up (this took the most time) and painting 2 coats primer and 2 coats of finish paint.
If I charged $20 an hour labor, I think I could build an EM complete cabinet for around $300.