You be able to repair the existing. Remove the doors and then the frames and see if for the most part they are sound. You can apply epoxy resin and filler on the bacj edges and fill the gaps. Then you would add some gelcoat tinted to your color. If te frames are usable, that will be a lot less work.
If the gouges and cracks ar not too bad, you can use MarineTex also but the color won' match if that is an issue.
You be able to repair the existing. Remove the doors and then the frames and see if for the most part they are sound. You can apply epoxy resin and filler on the bacj edges and fill the gaps. Then you would add some gelcoat tinted to your color. If te frames are usable, that will be a lot less work.
If the gouges and cracks ar not too bad, you can use MarineTex also but the color won' match if that is an issue.
Someone just did this repair using superglue and baking powder will see of incandescent fond the thread (also search youtube), came out good but not sure about longevity.
I don't think that I would be happy with that substitution. Somebody like Finnaddict Marine could give you an exact duplicate, with that photo, the outside dimensions of the frame, and the dimensions of the door.
The screws are so close to the edge of the frame that it makes me think the cut-out may be too large, and you might upsize the whole thing to fit better. What are the dimensions?
Finnaddict's website may be undergoing a makeover at the moment, but they are also on Facebook. They are in Benson, NC., where are you?