Over the years, there have been all sorts of screwball ideas about how to improve the dipper tray. That is no doubt one of them. I've even seen holes drilled in the bottom of the tray. I think that was done so that ALL of the oil would be removed when the sump is drained for a service and no old oil will contaminate the new. Pity about the big ends running dry on every start up!
Who knows what they were thinking. I'd just weld up those holes and use that tray.