The PVC rack is good as far as it goes. However, I see points to
improve for safety.

1.) Two small zip ties at front of rack are not nearly enough fastening
to keep the rack stable when loaded. This point needs to be a hard
mechanical joint that FIRMLY fastens the front of the rack to the frame
to limit side to side sway. My guess is this joint will fail first time out.

2.) the rack needs more solid fastening at the wheel mount to prevent the
rack from swaying & wallowing out the through bolt holes in the pipe. Place
a wood rod "inside" the pipe to add stiffness.

3.) load ALL heavy cargo in the very bottom of the basket to limit sway while
riding.

These points will improve a very good idea.