Again... Hypex FA122 backbox... Suggestions?

EDIT: Posted same query to Construction Tips subforum last week, but no dice so far. Hope this re-post is allowable. Thanks.

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Hi.

Trying to get a clear picture of production costs on a 2-way active enclosure using a Hypex FA122 plate amp. Guessing that some of you folks have had to address the lack of readymade backboxes for FAxxx series already. If so... please share your UL94 VO+V1 solutions here.

TIA.

Brian