Need advice on passive heating system zone 8/9

Hi there fellow permies!
Maybe you guys can help me out or point me in the direction of someone who can.
My partner and I are designing a system on our terrace to heat our apartment and keep us warm during the winter months. We live in Provence, France (Zone 8/9) so the winter is not long but still quite cold. We were wondering if anyone could help us out with input and ideas. We live on the top floor of a 5 story building, its a small place with a mezzanine and plenty of south-west facing windows onto a 15m² terrace with a south facing and north facing wall on each end.
The main objectives are
1. for the system to be solar 'powered'
2. not be a permanent structure (we're renting)
3. must only use recupe or recycled materials (for eg. from building sites and the street).
4. needs to incorporate an area for cultivation of vegetables and edible plants.
The plan so far is to build a raised bed/cold frame against a south facing wall connected to a small rectangular greenhouse that frames a low laying window leading into the apartment. This is only an idea for the moment and we are totally open to new suggestions.
We'd really appreciate any help we can get and want to have it constructed in the next two weeks.

Ouch - two weeks? That is not a lot of time for planning. Take a look at this site and he has many good plans for solar. Some are expensive and more long term but some of the ideas would be good for a rental place and less expensive.

http://www.builditsolar.com/

would a "heat grabber" design something like this work:



http://www.jrwhipple.com/sr/solheater.html

the build it solar site, as mentioned above, is a great resource.
specifically: http://www.builditsolar.com/Projects/SpaceHeating/Space_Heating.htm

Good idea and great drawing. Thanks for the sketch.