Yes, your shed does need a base. This is to give it a solid, level foundation. Open soil will not help with the longevity of the shed itself or the contents within. The best materials to use to make your shed base are concrete, natural stone or wood.
Invergarry
Invergarry (population 438) is a village in the Highlands of Scotland. It is in the Great Glen, near where the River Garry streams into Loch Oich. Near the centre of the town is the junction in between the A82 road (from Inverness to Fort William) and the A87 road which branches off to the west in the direction of Skye. The destroyed Invergarry Castle is positioned near the town on Creagan an Fhithich (the Raven's Rock), overlooking Loch Oich. Along with playing host to the regional shinty club, Glengarry Shinty Club, it is the house town of shinty tale, James Clark. It has a Primary School with a roll of 33.