I'm installing a built-in oven in an 80" high pantry cabinet. The oven installation instructions say to allow a minimum cutout depth of 23 1/2". The cabinet depth is 23 3/4", but that includes 3/4" for the rear panel, so the interior depth is only 23". I can add a face frame if necessary, to provide another 3/4" of depth, but I'd rather not do that for aesthetic reasons (none of the cabinets have face frames now). Any reason I can't (or shouldn't) remove the back panel from that section of the cabinet? The wall behind the cabinet is standard sheetrock.