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First we really need to know the year so we can recommend a forward casting platform.

I would also look through the OEM Parts Photo section and start seeing photos of original parts.
Here is an original casting platform for 1976 and earlier Montauk models.
http://www.whalercentral.com/photogal...oto_id=362

And then I would take a look through the download section for other drawings.
Here is a drawing of a Sakonnet model forward casting deck made of wood.
http://www.whalercentral.com/download...?cat_id=13
And here is a photo of the forward casting deck installed.
http://www.whalercentral.com/userphot...hoto_id=86

So, spend a little time looking around and you will probably find many ideas.