[TARGETS...Type of steel and how thick?]

5 hours ago, Shotgun Willie Nelson said:

Nice stand set up, looks like something I could do. How often do you have to replace the 2x4 center post?

Usually every spring.  The upright post is not joined to the base. 

[TARGETS...Type of steel and how thick?]

AR500 steel IDPA/IPSC  2/3 Traget 3/8x12x20.  From Bullseyemetals.com.  Two of these cost $92.00.

I have 5 stands that I build which gives two rows of 5.