As mentioned, the design is not ideal. But, since you are this far I'd suggest:
1) hold it together with tape from the outside
2) lay a thick fillet of JB Weld (or other strong epoxy) on each inside edge
Slow setting epoxy is stronger. May need 30 min for each fillet.
If you don't have access to black spray paint, line the inside with black fabric.
1) hold it together with tape from the outside
2) lay a thick fillet of JB Weld (or other strong epoxy) on each inside edge
Slow setting epoxy is stronger. May need 30 min for each fillet.
If you don't have access to black spray paint, line the inside with black fabric.