idk what all this talk about having a full hall being the only way to get rewards is all about. anet always stated that you got rewards based upon the statues/weapons/minis etc. in your hall. it never said anything about it having to be full. want proof? here you go:
http://wiki.guildwars.com/wiki/Hall_of_Monuments
excerpt from link: "It does not support bulk transfer of armor, items, characters, or gold. However, acquiring select items in GW1 will confer benefits in GW2 via the Hall of Monuments.
Each of your GW1 characters has its own Hall of Monuments. However, the rewards will be "unlocked" account-wide and will transfer to your GW2 account, and it is possible to display all monuments attained on one account in GW1. Accomplishments dedicated in GW1's Hall of Monuments will continue to update your GW2 account even after GW2's release."