Ahh now I get it, I think lol. To find the center, you just measure say a 2x4 (3.5 in) and divide by 2 to get 1.75, this is how you get your cross lines, correct ? Then 1" from each side.
Yes. Exactly.
I don't have a drill press, I have a power drill, do they have something in the form of a bit that I can use ? Do you cut your own dowels from the long ones they sell at Home Depot or do they have preset sizes based on your hole ?
I bought pre-cut 3/8"x2" dowels. Just use a 3/8" bit to drill your holes in your jig. The only reason I used the drill press was to make sure that the holes were perfectly straight. A power drill would work, just be careful.
Re: your box frame setup, curious why the two ends were placed differently from the others, one inside and one outside, does that make it more stable ?
I did that so that the upper and lower frames would be staggered from the legs on most corners. If you look at the last pic the legs are staggered from the top boards.