Moderation models: Moderators as interaction terms, and model drawing

This link depicts a simple manifest-variable moderation as shown in the images below (along with Mplus code). The path diagrams don't inclde residuals, or, for instance moderator -> predictor covariance, nor how covariance is implement (if at all) between XW and the main effects X and W.

A couple of questions.

1. Does anyone have a pointer to path diagrams that are complete (i.e with residuals and covariances?)
2. Using RAM, can the moderation be implemented as an algebra on the X->Y path?