Drilling and cutting the stock aluminum was good practice for the real thing. I have 746 couplers on hand right now (others on order). I went ahead and drilled holes into the frame. Using 1 - 2 mm all nation shim and 2 screws did the trick. The bit I used was 1/16 - made for a tight and secure fit for 2-56 sheet metal screws. I did order some metal draft gear boxes to replace the plastic ones.
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