What is the best way to join these wooden beams together, to form a rectangle box which is capable of significant weight? I'd like the ability to deconstruct it, so something involving metal bolts would be preferred.
Here is an example of what the end result would look like, however they are using screws, which I'd like to avoid.
I'm not sure if I should be using a steel side plate on each corner, or if I should put a bolt straight through and join each beam together. Although if I use bolts, then I always end up with one half being loose (as they overlap).