Don't remember the name but it's a tropical house plant that needs to be inside at this time of the year, if you weren't aware of that already.

That's an easy one...Maclura pomifera (aka Osage-orange).

Hi Creativeslime, I understand that Eucalyptus is widely grown in forest plantations in your country, is that right?

Impressive amount of thought and work going into this ... I will enjoy looking into what you are proposing; until I can, I wanted to throw another option to you just because of the general look of it (there are so many out there, that is part of the joy). I have a "Sherwood Frost" arborvitae that is very slow growing, and tops out at about ten feet. It is a wider pyramidal shape, but is definitely NOT deer-proof. Perhaps part of what you like about the aesthetics of the chamy obtusa is the architectural way that their fronds splay and twist a bit. It is definitely suited as a specimen focal point. I actually believe mine failed because I had them in very sandy soil. They became thinned out with interior browning instead of the full look that I was going for (as a hedge). However, few chamaecyparis will take soil that is too moist. I did have one in the blueish family that actually liked a wet soil (will have to look back to see what sub-species it was). If you continue to look hard enough, you will find what you want! http://woodyplants.nres.uiuc.edu/plant/thuocsf