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Max,

For the large radius, the quarter pipe has a thickness of 3.5 mm This is sufficiently stiff. Because of the routing it is stuck by itself. however, due to the use of polymer  sealant, everything is glued and airtight. What now remains to be done is the grill, warnex paint and wiring.

After that comes the hard part. Making processor settings. As said initially the vhf passive using a Convair crossover. maybe later when I build 2 more I will switch to 3 way active. For the time being, problems with gluing the speaker foam to the grille. it does not stick enough. Thank you for your response. As soon as they are ready I will post some photos