That is a sweet build, looks a blast!
Just one concern- the wheels look like those from harbour freight or similar, designed for hand trucks. I had these on my kart- one broke off on the first ride!
Other than that, its awesome! I like the colour, and recycling materials is great.
One thought I had is did you do anything to the bike steering so its positively bolted together or is it just the typical bicycle steering wedge tightened up.
I wouldnt trust just the wedge but it might be OK.
it did come lose on me because I was adjusting the brake but hit a bench and it turned the wedge bolt and steering but other then that time its bin fine