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I'd caution against mixing yourself it's a horrible job, can be difficult to get the mix right even using pre-mix 50N bags, and will fuck the cement mixer.
Much better to get in one of the mobile batching plants on the back of a wagon as you won't need to do volumetric calcs for ordering and you only pay for what you use. They can pump it a limited distance although barrowing further will be a pain.
Bobbo
I'm going down the pilings route using cardboard forms.
At some point, I should possibly have an engineer do some fag packet calculations, but my own suggest that 12 pilings, each 300mm diameter & 600m deep, using high strength concrete and a bit of rebar, should support many times the weight of the office I have planned.
It will also use 6 - 8 times less concrete than a slab, meaning I can mix it myself (once I figure out a way to get the cement mixer down the side of the house...).