Hard to say exactly. There's definately no one single right way to do it.
Without knowing dimensions, it's hard to say for sure "do this, do that".
This is what I'd do:
The top part is definately a good concept for i-beam trussing, maybe stretched wide but shrunk in the vertical. You might choose to double up on the i-beam sections, half and half, which may be more accurate. I-beam trussing is in 5-foot sections. The rising arms are definately T-bar, just stretch to meet the specs.
The bottom part, you could cheat and just do a box. If you wanted to be a little more stylish, I'd again go with i-beam trussing turned sidewways and shrunk in the appropriate dimensions for the sides. Once you do one, copy it for the second. Now, the middle part, you ahve 4 cross-bars. You could either use T-bars, which would be mor accurate as far as looks are concerned. If you weren't totally concerned about the look being 100% accurate, you could again use the i-beam trussing, 2 items. Again, fit one, then copy it and move it down for the second.
Once you get this ALL done, group those items together so you can move them as ONE element. Then if you haven't been saving your stage, SAVE IT!! Save it as a "boilerplate" so you can design your room around/with this item in it. Like "Stand in Room Starter" is your base document. Then have it saved as as "Club 1" or "School dance" or "Big party" or whatever.
If you always set your stage and lighting the same way, add your lights into that structure and group that and use that as your starting point.
I'm sure someone could come up with a better method of building this.