Making your own Xenos can be tricky. A good thing to keep in mind is to use humanity as a point of comparison. There are many Xenos in the galaxy and they have numerous attributes. Thus it is best to treat humanity as the standard for comparison. Also, many people will be tempted to create Super Xenos. Though there are no rules against it so long as user respect canon, this is a bad practice as there is such a thing as too strong or too perfect. Having strong Xenos is fine, but make sure to keep it within reason. A good way of "toning back" a very strong xenos race is adding hinderances and using high point costs. Make loopholes other races can exploit. This helps level the playing field a bit.