Drilling holes into the Michell Orbe SE subchasis?

Any reputable machine shop could do it. The holes would not have to be an exact mirror image of the holes on the right side or ear as you say. The arm you choose (and how its mounted) would dictate where they need to be I would think for ease of set up.If the arm you choose is fixed in place with a nut from underneath such as a rega an others it would not matter. If it is screwed in place to the arm plate then those holes would be critical.Have you also conscidered that because two arms was not part of the original design if your heading for problems?Remember now the arm would be parallel to the front and back and not the sides of the sub chassi as the original arm. Curious though, where would you place the motor then and have you conscidered the resale after doing so? Cheers