With the ballasted space-frame in place, carry out a risk assessment.
I've done that, and it's primary finding is that if one of those bar-bell weights drops on your head during the next phase, then there probably won't be a next phase.
That done and wearing a hard-hat, hi-visibility tabard and goggles (yeah, right) set the four kitchen-cabinet corner brackets in place before marking those holes adjacent the space-frame with a pencil or bradawl.
These are going to be supporting your weight during flight, so make sure whilst you're at Home Depot that the assistant has selected aerospace-grade cabinet brackets.
Failure to do so invalidates the warranty that I won't be providing anyway.
