There are two primary types of steel buildings approved in Texas: engineered and permitted.
Engineered structures are usually I beam internal support structures, with poured in concrete floors. Although these buildings last for centuries, expect building costs to cause you a heart attack. You generally have no need to go to that expense.
Permitted steel buildings use International Building Code as a reference and do not require a Registered Professional Engineer to sign off on them. These structures use steel studs much as would a conventional bearing wall home. Only, instead of wood, you have used steel channel.
That won't get you out of wood in your building entirely: steel studs have a nasty tendency to twist and buckle unless you support them with OSB. And most times, Building and Safety will use lots of red pencil on your drawings if you call out anything but wooden trusses . . . which pretty much defeats the purpose of steel construction.
The alternative to seek is concrete. Tip-up wall construction, with exposed aggregate, has gained considerable popularity of late: 1/4 the building cost of wood and there is not one termite on record that gnaws concrete. The down side is insulation. I recommend sprayed-in urethane insulation even in wood construction: urethane gives you R-28 walls and R-48 ceilings, increases your structural strength greatly, and does not leak.
Another method comes to mind: steel studs, concrete sheet goods outside, urethane insulation, and 5/8 drywall on all interior walls. Build as usual but assure that plumbing and electrical services all go in chases, not directly exposed to urethane insulation: code violations can earn you a "stop work" or even a "condemn and destroy" order from Building and Safety.
I agree with that: I have seen how some people build homes.
