Mitchell Drywall & Plastering, Inc. Mitchell Drywall & Plastering Inc. has been serving the Ozarks since 1992. Since its inception, MDPI, founded by Delvan R. Mitchell Sr., has been delivering the highest quality drywall, plastering, and construction contracting solutions. MDPI has built its reputation on providing turnkey commercial construction solutions with a level of quality, service and value that exceeds expectations from start to finish. .