i see nothing wrong with welding.. for a start it is all along the seam, not a point loading. also is usually to weld twice across the lap, one on inside, other on outside. If you cant weld, assemble it with small engine screws and nuts the same size as rivets, but smear epoxy in the joints. This alone will be strong enough. but you can either keep the screwws there ( dab epoxy over the nuts to stop them vibrating loose and gives smooth surface) or replace the screws with rivets. So now it is held together twice. Epoxy and screws or epoxy and rivets, the joints being full of epoxy wont leak. Note use flexible epoxy from choice.
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