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Welcome to the Bunnings Workshop community @npj. It's wonderful to have you join us, and many thanks for your question about constructing a shed base.
The manufacturer states: It is strongly recommended to secure the shed to an immovable object or anchor to the ground by drilling holes in the shed floor (at the pre-marked locations) and inserting proper screws into the ground. So, at a minimum, they are recommending that the shed be fixed down. If it's not, any gust of wind potentially has the power to blow this relatively lightweight structure away. Could you compromise and use actual concrete pavers under the shed section that the structure could be fixed to and save the pebbles for around the outside perimeter?
Please let me know if you have any questions.
Mitchell
Good afternoon @npj
Firstly welcome to the Bunnings community 
We definently will have a bunch of ideas for you, I always think the more we look at something the more we get to modify what we first thought.
Interesting question I must admit. Having clay so close to your surface I would use as an advange ofr paving it, Using a shove scrape that 50mm of soil away back to bare clay, put some pavers down (I keep an eye out on buy sell, giveaway sites) directly on the clay. I have done that for various paths over the years and they are still going strong.
I also like the idea of those pebbles and that mat (I usually run screaming from pebbles after having to dig ones out of gardens for what seems like forever) But can imagine how they would look aroind and even under the shed.
The only thing I could rally offer to help you decide on what you want is to imagine what you will be storing in the shed potentially in a few years time. Anything heavy and I will gaurentee you will want a solid base, even a lawnmower is easier to shift around on something solid rather then dirt.
Cant wait to see some pics on how you go forward even if its just dirt
Dave
Hi @npj
I've just been in contact with the Keter technical team, and they informed me that the Keter 1.4 x 0.73 x 1.7m Plastic High Store Shed also comes with the heavy floor the same as the High Store Plus. But if you are keen to get the +Plus model it can be ordered at the special orders desk of your local store. I recommend visiting your local store and getting a quote from the special orders team and asking for an estimate as to when the shed will arrive at the store.
If you have any other questions we can help with, please let us know.
Eric
Morning @npj
Id just go for a level between the two, use a shovel blade at a low angle and "scrape" horizontaly at the soil/clay use the bit that you scrape off to raise the lower side.
You can see the soil slopes here, I just shaved the high side and used it low side and then tamped it (You could use the end of a timber post to pack it down really or just smack down a paver a few times. )
That way you have an overall reduction of 25mmm but it will be level.
Dave
