The VBA driven Excel spreadsheet follows the official rules for GEM (see here) and allows you to select your preferred US and International stocks fund. This applies also for the out-of-market bond fund and for the proxy fund for observing the risk free rate. The lookback parameter for both relative and absolute momentum is user adjustable.
[Update] In the latest edition of the spreadsheet [v3], the widely used 60/40 benchmark is depicted as a reference point. The 60/40 portfolio holds 60% equities and 40% bonds with monthly rebalancing. In the spreadsheet the 60/40 mix is composed of the US stocks fund and the out-of-market bond fund.
Results for both the GEM and 60/40 portfolios as well as the separate components are presented in tabular and graphical format.