I have used the SAP sizing guide in order to do a sizing for some SAP SSM10 implementations.  I hope you can used it too  , in my experience gives results very near to reality of a solution for an implementation.

Basically, you have to consider 3 primary issues:

1. Number and type of concurrent users

2. Number of cubes

3. Volume of cubes

Next an example of one of my estimations:

 

# USERS saps user * saps
Business User 25 70 1750
0
Casual User 25 378 9450
0
Power User
  Dashboard
4 1445 5780
0
Power User
  Initiatives
4 266 1064
0
Power User
  Strategy
4 191 764
0
Power User
  Report
4 827 3308
0
Power User
  Scorecard
4 203 812
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