The Craft downtime activity can also be used for buildings, engineering devices, and other projects. Each check requires a week of work and access to an amount of gold worth of materials. The DC and materials cost are determined by the project’s complexity. The scope of the project determines how many checks are required to complete it.
#### Engineering Items
| Complexity | DC | Cost per Week | Examples |
| ------------- | --- | ------------- | ------------------------------------------------------------------------------------------------------------------------ |
| Rudimentary | 13 | 10 gp | Barge, basic cart, rowboat, single-room building |
| Simple | 18 | 50 gp | Basic sailboat, geared mechanism, one-story building, short bridge, wagon |
| Moderate | 22 | 250 gp | Basic steam engine, complex geared mechanism, large or fortified building, long bridge, seafaring vessel, siege weaponry |
| Advanced | 26 | 500 gp | Castle, lock and damworks, locomotive, ship of the line |
| Revolutionary | 29 | 1,000 gp | Airship, power plants, railroad networks |
| Incredible | 32 | 2,000 gp | A sapient clockwork construct |
**Note:** Not all technologies are available in all settings, and ultimately the machines a character is able to craft using Engineering are at the Narrator’s discretion.
#### Engineering Time
| Object Size | Successful Work Weeks Required | Examples |
| ----------- | ------------------------------ | ---------------------------------------------------------------------------------- |
| Tiny | 1 | Pocket watch, a clockwork code cypher |
| Small | 2 | Prosthetic hand or prosthetic leg for a Medium-sized creature |
| Medium | 4 | Cabinet of automated minstrels |
| Large | 8 | Self-propelled wagon, a one-room building |
| Huge* | 32 | Small airship, a clockwork giant, a locomotive engine, a villager’s house |
| Colossal* | 64 | Steam-powered city gates, a bascule bridge, a large airship, a noble’s city estate |
| Monumental* | 128+ | A dam, a massive clocktower, an airship port, a palace |
\*Projects of this size often require a team of assistants and laborers
#crafting #engineering