I think a way to stop it will be judges who wont build have to be chosen, in each game, two judges will be chosen randomly and wont build, instead when it is building time they will look on everyone's progress, thay cant chat so they cant help anyone and when it is judging time, the players can see the builds but not vote while the judges would vote and they kinda would vote fairly as they r not building and do not care since they do not build, a judge gets extra XP and money, that may make it fair but my idea has a disadvantage, a judge may be a friend of a builder and he will vote terrible to everyone and amazing to his friend, ill think about it and try to find a way to prevent that happening but it seems quite impossible to prevent that happening