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It's will be better to know your designing idea. If this is your first DIY this such kind of machine why don't you try a tiny sample first. The 3m long journey would be more different as well!
The déign idea is pretty much the same as in the Video I showed.
Here is another video of the machine
https://www.youtube.com/watch?v=ZUiXjn0QYIw
I need the 3m-3.5m because this is the maximum length the Surfboards will be.
So with the Hotwire the rough shape of the Surfboard is cut out. Then a wooden stringer is glued in the middle. Afterwards a router cuts out the precise shape.