What tools have you got? I'm fancying some too but can't justify a half decent table saw or see a sensible way around one. I guess paying to have the slats milled would work but it goes against my inclinations.
I think you need to find hinges that will fit first. The rest is just woodwork. Will be a nice project I think. Quality materials will be key as the sections will be relatively thin.
Was going to add this to my earlier reply but was too slow with the edit.
Have a look through Peter Millard's YouTube videos on tracksaws for some useful tips for the table saw deficient workshop. I own a tablesaw and a bandsaw but frequently find that making do with a track/plunge saw is quicker than setting them up.
Press Release Arc'teryx Climb Academy returns to the Lake District: May 25th – 27th
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News Lorraine McCall Starts Grahams Round
Lorraine McCall began her attempt today at a continuous, self-powered round of the Grahams, a four-month tour of upland Scotland combining walking and bikepacking. If successful, she'll be the first person that we know of to do it.