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The usual methods are:

  1. Careful measurement. Really this doesn't need to be that precise, you are not looking for a press-fit between bolts and clearance holes. 

    If it goes wrong, just elongate a hole into a slot using whatever tools you have to hand (e.g. a round file, clapped-out old Bridgeport, ...)

      - Remember: "A grinder file/filler and paint make me the welder machinist I ain't".

  2. Put pointy or painty things into the holes then press the steel plate down in place to mark it. In the dead-tree-carcass world there are things called "dowel pins" used for this kind of thing.

The usual methods are:

  1. Careful measurement. Really this doesn't need to be that precise, you are not looking for a press-fit between bolts and clearance holes. If it goes wrong, just elongate a hole into a slot using whatever tools you have to hand (e.g. a round file)

      Remember: "A grinder file/filler and paint make me the welder machinist I ain't".

  2. Put pointy or painty things into the holes then press the steel plate down in place to mark it. In the dead-tree-carcass world there are things called "dowel pins" used for this kind of thing.

The usual methods are:

  1. Careful measurement. Really this doesn't need to be that precise, you are not looking for a press-fit between bolts and clearance holes. 

    If it goes wrong, just elongate a hole into a slot using whatever tools you have to hand (e.g. a round file, clapped-out old Bridgeport, ...) - Remember: "A grinder file/filler and paint make me the welder machinist I ain't".

  2. Put pointy or painty things into the holes then press the steel plate down in place to mark it. In the dead-tree-carcass world there are things called "dowel pins" used for this kind of thing.

2 added 109 characters in body
source | link

The usual methods are:

  1. Careful measurement. Really this doesn't need to be that precise, you are not looking for a press-fit between bolts and clearance holes. If it goes wrong, just elongate a hole into a slot using whatever tools you have to hand (e.g. a round file)

    Remember: "A grinder file/filler and paint make me the welder machinist I ain't".

  2. Put pointy or painty things into the holes then press the steel plate down in place to mark it. In the dead-tree-carcass world there are things called "dowel pins" used for this kind of thing.

The usual methods are:

  1. Careful measurement. Really this doesn't need to be that precise, you are not looking for a press-fit between bolts and clearance holes.

  2. Put pointy or painty things into the holes then press the steel plate down in place to mark it. In the dead-tree-carcass world there are things called "dowel pins" used for this kind of thing.

The usual methods are:

  1. Careful measurement. Really this doesn't need to be that precise, you are not looking for a press-fit between bolts and clearance holes. If it goes wrong, just elongate a hole into a slot using whatever tools you have to hand (e.g. a round file)

    Remember: "A grinder file/filler and paint make me the welder machinist I ain't".

  2. Put pointy or painty things into the holes then press the steel plate down in place to mark it. In the dead-tree-carcass world there are things called "dowel pins" used for this kind of thing.

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source | link

The usual methods are:

  1. Careful measurement. Really this doesn't need to be that precise, you are not looking for a press-fit between bolts and clearance holes.

  2. Put pointy or painty things into the holes then press the steel plate down in place to mark it. In the dead-tree-carcass world there are things called "dowel pins" used for this kind of thing.