Elavated shed base

Hi,

After abit of advice in terms of the correct way to go about building a long lasting shed base to accomodate 14x12 shed. I may do this myself with a builder friend at hand or will get someone else in but still like to get my head around how it ideally 'should' be done.

I want to be able to get my bike in the shed/workshop, and our garden starts off on a higher flat level then then drops straight down for the rest of it.
Basically what I would like is the shed to be in the lower part but on a raised base so that the doors will clear the raised side so I can get my bike in.

The drop is about 1.5ft, so need to raise it by that much, how would one go about it?

In my non builder head, It would be dig abit down, build perimeter wall to level needed with foundation how deep?

kill weeds, membrane, hardcore, and about 4" concrete screed or something

Is that about right?

pic shows base for a 5.4 x 3.0 shed.

3 trenches 15cm deep x 30 cm wide dug equally spaced across the 3.0

raised height using 4 & 6 inch blocks.
intermediate supports 100 x 50 supported on timber posts concreted in at 75 cm centres

you can see floor joists of 150 x 50.....which we put 50 celotex between and covered with 18 mm wbp far eastern ply.

http://i1134.photobucket.com/albums/m607/fencer39/2012-08-06153609.jpg

That would work. Plans have changed though as it's a rented property landlords not keen on a big slab being put down. So the sheds moving down onto the lower part and have dug down, compacted and about 2" compacted type 1 going down. The shed will sit on treated 3x2 bearers.

I think that should be ok?