I thought you would like to know that our application engineering team has just released some Multisim user defined templates for creating custom Arduino shields. Each template includes a Multisim schematic with connectors to define inputs and outputs as well as an Ultiboard layout with the pin mapping and board outline. User defined templates are a new feature in Multisim and Ultiboard that provide a starting point to begin designing circuits and PCB layouts.
Here's the list of the Arduino shield templates available:
Arduino Mega 2560
Arduino MEGA ADK
Arduino Mini 05
You will need Circuit Design Suite (Multisim and Ultiboard) version 13.0 (or later). There is a new user component library that you merge with your existing library to add the additional symbols and footprints used in the template. For a detailed tutorial on using the new templates for creating Arduino shields go here.
Let me know if you have any feedback or questions on this or any other Multisim topics.