I do have plans to make an aluminium trigger down the road.
As for the ball gates, I'm not a big fan of Rock back, since I've been pretty exclusively a nelson guy (phantom) for the better part of the last decade. Not to say I haven't owned sheridans and the like, but I've always preferred the rock-forward. hence the modified stock feed system.
Plus it's fun to be able to say that my splatmasters have just as many if not more phantom parts than my phantom does...