License plates haven't rusted in KS in decades, made of aluminum.
I plan on a shooting house at some point, but will go std stud wall construction
to insulate. Probaby 2x6s, it worked so well in our Colorado house. Same exact
board feet of lumber in 2x6s on 24" centers or 2x4s on 16" centers, stud cost is
essentially identical, vertical strength per running foot is identical, too, but R19
insulation vs R11 insulation....nearly half the heat loss per square foot. That is
important here, winter and summer. Plus I can knock together a 12x12 building
in no time, and,
aside from the foundation, for about $650 in material.
A 4x4 treated lumber foundation with 3/4 plywood floor would be about $200 in
material, including Quikrete footers around 4x4 pillars.
Insulation would be about $105 (r19) and sheetrock, about another $100.
Depending on what you plan, shooting out of wind and rain, maybe no interior
at all, just studs. Or 4 season reloading and casting, heat/AC, electric power,
as your needs and budget deem necessary.
But a complete basic building shell 12x12 (144 ft2) should be well under $1000
if you can build it yourself. Even better if you have some salvage or scrap
to contribute.
I will likely start with basic shell and add an interior, and four season touches
over time, make it my reloading AND shooting place.
Cost doesn't scale directly by square footage. Dropping to 8x8 (64 ft2) will only save about 20%
on materials yet have right at about half the floor space. Going up to 14x14 will
get you 1/3 more area (196ft2) for probably $60-100 more in materials.
Bill