To start addressing leprechaun's suggestions, please add to your rough draft that your constitutional will make it impossible for a corporation or company to ever be viewed (under law) as an individual with many of the rights accorded to citizens.
This will go a long way in addressing several of his 'concerns'.
Jefferson proposed limiting the scope and power of constitutions in his early draft of the Bill of Rights - that idea and his plea to never have a standing army went down in defeat.
Now my suggestion is to make it clear that individual rights under your constitution must be broadly construed and interpreted while the rights of government must be narrowly construed.
Are you really think of putting altruists in positions of authority? Better re-think that one. True believers of any flavor are usually trouble.