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@gbj_tester
The frame was made for 50mm travel Rock Shox Mag 21, you should be able to get away with a modern 80mm travel fork, especially if you set it up with a decent amount of sag. There isn't much current product that meets these specs, but a few years back Marzocchi ECC versions and Fox Talas had adjustable travel and V-brake bosses, so you could use one of those 100-120mm travel forks wound down to 70-80mm. Putting a 100mm fork on it risks having it steer like a barge; it will be ridable, but not as much fun as it should be.
I think if it were my bike, I'd put a rigid fork on it with some big tyres and see how things panned out. You can always think about suspension again after you've dome some MTBing and found out what you like doing.