я делаю отверстия под мотор следующим образом: размечаю обклеиваю прозрачным скочем с двух сторон сверлю отверстие около линии разметки и через него начинаю ножницами выризать финиш шкуркой быстро просто и надежно))
А самое главное,дешево.
Большие и криволинейные - бормашинкой диском и т.д.
Я делал все одной насадкой, та что с наждачкой, ничего не облупляется и края сразу ровные, по углам сразу получается скругление(там под 90 и не надо)
Я уже где-то писал,повторюсь:иногда пользую фрезы,которые идут в комплекте с автомобильными датчиками парковки.Для отверстия под патрубок глушителя иногда самое то.Причем даже в дрель ее зажимать не нужно,от руки прекрасно прорезает:).
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