21. Add Cat. - Some cats may prefer to complete this step independently. Wormholes to the Caterverse are extremely stable and once
established will not close unless there is Catastrophic failure of your gate. In the case of such a major Catastrophe, you may need to take your Cat to a Veterinary professional for de-wormholing.
Additional build photos are available, as well as a PDF version on my site here: http://misscarlotta.com/tag/stargate/