Firewall's new society will require an industrial base, but Solemn is hostile to both nanofabrication and traditional industry. Like with the other Solemn proposals, their solution is biological. An egg, containing a genetic blueprint of the item to be grown, and the needed feedstock.
All of the costs of nanofabrication are up-front, which has advantages and disadvantages. An egg does not require a power source, as it contains what energy it will need in the form of fat, and does not require a continuous source of material, as again it contains what it will need. Once an egg has been "laid" it remains viable for ~3 years, or if stored properly, indefinitely.
The current difficulty with the project is the creation of an egg-layer. To be viable on Solemn, some sort of animal or organ must be created, capable of translating nanofabrication blueprints into a genetic code, then creating and laying the egg. The eggs created so far have all been essentially from scratch, with blueprint translations requiring touching-up and experimentation.
Organic but non-living objects can be grown in an egg at a rate of 2 hours per cost category of the item. Living things (such as morphs and animals) can be grown in an egg at a rate depending on their size: 1 year if small, 1.5 years if normal, 2 years if large.