Placement threw you off? Could you specify a better location than centered between the edge of the port 45 and the end of the panel? I located the precise point, the builder has full discretion regarding how far to take it. If he located the damn dowel 2" off location do you think the enclosure would fail? Or maybe any bracing close to the location will help? I just LOVE having my designs critiqued after throwing them online. It's always easier to chime in than actually throw something out there. 4.3ft3 net 17.9in^ft3 tuned low as designed. Add bracing in the port or not... dealers choice
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Asking for a friend... where would you brace this thing? Russian 13 ply single ply construction.