Firstly make sure you build it so that you can extend onto it easily in the future....believe me, a shed is never big enough.
BIGGER is definitely better when it comes to sheds. :)
There are so many "goodies" out there just waiting for you to snap them up and put them in your shed ;)
Height is a must, especially in hot climates, also it allows for a mezzanine floor/s, they are great for storage etc,
Good insulation which keeps heat out in summer, warmth in for winter, and most of all condensation dripping inside in winter.
Another must although easier said than done, is sealing/dust-proofing as droughts and dust storms seem to becoming common
events in Australia.
A good strong slab, especially where you may install a hoist one day, even if you have not considered one now.
Consider going for a lot higher MPA Concrete for strength, it doesn't cost much more per cubic metre, and on an overall percentage
cost on the job it's pittance. Plastic under the slab to prevent moisture coming through and a sealer over the finished job.
Also consider strong roofing framework, as a gantry is a great asset, it trumps stuffing around with engine cranes.
Plenty of power points, and a few 15 Amp ones, good lighting.
Security is another consideration as power tools etc are a target for thieves and easily sold on, and as Land Rovers are going up value
you will want your harem of 80 inch vehicles locked away safe n sound.
There is plenty of scum out there just waiting to steel your hard earned prized possessions.
Bar work over the windows, or even better, lockable shutters instead.
Good Luck
