Jelly, I have done exactly what you are trying to do with only the difference of using ICF instead of CMU. Here is what you need to do,imho:
Considering you are using SIPs:
a. Dig your footers, place horizontal rebar as per code, place vertical rebar 36" high every 2 feet or as per code.
a. pour your footers
b. Build (or have someone build it it for you) your CMU 3 blocks high (8" per block including mortar joints = 24 inches)
c. 3rd. row of blocks needs to be a bond bond beam.
d. In this bond beam you put #4 rebar horizontally
e. Tie vertical rebar to horizontal rebar ( this should be below the top of the bond beam.
f. Grind off or cut off the rest of the vertical rebar above the horizintal rebar. This again is below the top of the bond beam
g. Fill either all the cells with grout (mortar or conrete with 1/2 aggregate) or minimally the cells that have the vertical rebar in it.
h. Fill the inside of your walls with sand. Make sure you use a vibrating tamper every 6 inches ( can even wet the sand to get better compaction or let mother nature rain on it)
i. Having compacted the sand in this fashion you will have achieved a proctor 95% (google it) compaction which will support the slab (no structural slab needed here)
j. Get the plumber to put in your drainage pipes where necessary. Have a pluming inspection.
k. fill in all the drainage pipes and compact everything to 4-5" below the top of the bond beam.
l. call the bug man and have him spray the interior of all perimeter walls and were the drainage and water entrace penetrations are.
m. lay down your plastic (vapor barrier) At this point I would find out how you are going to connect the SIPS to the stemwall
n. make provisions in the stemwall holes left over (or if you have filled them all you need to do this step before filling them all) for the SIPS connection.
o. decide whether you put down wiremesh or use fiber mesh in concrete (I used fibermesh)
p. pour your concrete slab
q. You are officially out of the ground and ready for SIPS to be installed. No wheels re-invented.

Hope this helps.

Jelly,

I call this a raised slab or an elevated slab.  This pictures seems to show that the edge of the slab was formed.  I have always used an "L" concrete block to form the edge of the raised slab.  Less work.

I believe a raised slab would be the way to go on your lot.  I would definitely stay away from a crawl space in an area with a high water table.