Urethane Foam (mold) or Fiberglass for midbass door panel install?

[omarmipi 10+ year member]

I have prepped my door panel and most of the wooden pieces that I will use in the install. I would like to create a map pocket in the panel and also incorporate the midbass grill. I would appreciate some suggestions on my door panel project. I cut some fiberglass sections fit the panel but I also have some expanding urethane foam (cut/sandable). Which method should I use, or should I try something else?

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