First plans for stage 1 was to build a duckweed device that would grow harvest and dehydrate the duckweed. Dehydrating would serve two purposes One would be to allow measurement of carbon content without the extra water. The second would be to put it on a form that is storable and not broken back down into CO2.
The objective for this March is to create a personal aquaponics system that will provide maintenance free indoor greenspace (just add water). The next step will be a personal sequestering system that will store the harvested carbon for longer term. There are large multi-million dollar demonstration projects that are doing this but there has been no attempt to scale the process down to a smaller format that can be more easily replicated and distributed. (under Links you can see universities building artificial trees.)