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hugo7-
It was very straight forward - although I did have access to a cement mixer. There wasn't a huge amount of concrete needed (single digit bags of cement), but it would have been zero fun doing that by hand.
The digging took maybe 2 days, and the pouring could have been done in a single day.
The roof is looking OK - I still haven't got round to planting out more varieties of sedum / alpines, but it's otherwise well established.
NotThamesWater
I did concrete piles for my garden room, using cardboard forms & reinforced with rebar. I think it worked out to 1/2 the cost of an equivalent flat base.