Dip Station specs

[IronGuy]

Coach Rip (or anyone who might know),

I'm planning to build a dip station for my barn gym exactly like the one pictured in SSBBT V2, p. 261.

Respectfully request some assistance is the exact specs.

By looking at the picture, I'm guessing the following:

1. The front L bracket is approx 20 inches with holes @ 16" on center (accomodate stud wall mounting).
2. Vertical bar supports are approx 48"
3. Vertical support base is 2x4" steel stock
4. Horizontal supports are approx 3" apart on wall mount bracket

I was hoping you could provide:

1. Length of the horizontal bars
2. Length of vertical support base

Thanks!

[Mark Rippetoe]

1. The front L bracket is approx 20 inches with holes @ 16" on center (accomodate stud wall mounting). Correct.
2. Vertical bar supports are approx 48" Height is 53"
3. Vertical support base is 2x4" steel stock It is a piece of plate screwed onto a 2x4.
4. Horizontal supports are approx 3" apart on wall mount bracket They are 4" apart at the wall, 40" long and 40" apart at the ends.

I was hoping you could provide:

1. Length of the horizontal bars 40"
2. Length of vertical support base 32"