I'm heading out on vacation for three weeks but if this is still here when I get back I'll be pleased.

I do have two suggestions though:

1.) Establish the limitations of magic before characters start being created.  Make certain that those limitations insure pistols and lever action rifles are still relevant.

2.) Don't bother with Texas.  Have fun with altering the existing stereotypes to fit your vision.  For example, maybe the orcs were defeated by the combined races and now are subjugated and work corn fields and sugar plantations. Maybe various factions are pro or anti-emancipation.  It's up to you.   Have fun with it!