Did you read http://google.github.io/flatbuffers/flatbuffers_guide_tutorial.html ?

Thank you for pointing that out.
weapons:[Weapon]; is the kind of example I was looking for and I had missed it when I skimmed through it initially. Also, if I had another table, say
table Task {
idx:int64 = 0;
title:string;
}

since there is only one root_type entry, does it matter if I serialize/deserialize multiple arrays like this:
table ProjList {
PList:[Proj];
}
table TaskList {
TList:[Task];
}

instead of combining like this:
table MyList {
PList:[Proj];
TList:[Task];
}

You're likely better off combining, will give you more flexibility.