Hypertufa... Ledges?

Hi everyone,

   I have a dry, sunny section of my yard that I've been using to cram
   every alpine I find into.  Unfortunately, Illinois isn't exactly known
   for its terrain, so I've been losing a lot of stuff because of drainage
   issues.

   What I would like to do is create a rock garden with 'shelves' that
   plants are in; something that looks natural, but allows the plants 
   lots of room to grow.

   Rock seems to be pretty expensive (and heavy), so I was considering
   making large flat 'rocks' out of hypertufa (a Portland 
   cement/peat moss/perlite mix) and stacking or cementing those 
   into place.

   Has anyone used hypertufa for this that can share their experiences?

   I was even thinking that it might be neat to build it very high,
   like 8' up and 10' deep.  I could build a framework using cinder
   blocks, mortar them into place, then put a pond liner over it all
   and start putting the faux stones into place in a type of terrace.
   The area underneath could become a storage shed, but the plants would
   grow on top in a foot of soil or so.

   Comments?

Chris

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