You'll notice that the cargo frame isn't exactly flush with the bicycle frame.
So there will be a slight backward slant to the floor.
However, it butts up against the bottom of the top tube
and firmly up against the headset tube in the rear.
It's not going anywhere.
This is looking at the bottom of the cargo frame ...
before 45° braces were installed.
There it is out in the sun with handlebars.
You can also see the 45° support bars that I welded to each end of the cargo floor.
Oh yes, I cleaned and re-greased the bearings for the bottom bracket and put the crank back in.
HOWEVER, I don't yet have the steering rod attached ...
Which makes the bike a little awkward to move around.
(the handlebars just spin
and the front wheel goes any which way)