3D Printed Coffee Table - Fibreglass + Finishing Help?!

I will try and make this as brief as possible, but apologies if it is a bit long winded. I have designed an made the structure for a coffee table - very textured, irregular and natural form.

I want to reinforce the table with fibreglass, but I am unsure whether to fibreglass the interior and exterior or just the interior. In the photos you can see that there are areas where the print failed, with small gaps and warped areas. My plan is to bridge these with the interior fibreglass, and then fill the exterior of the holes with Milliput. However, I am unsure whether:

1: If I also fibreglass the exterior with a light layer of chopped strand Matt, to what extent will I lose the detail of the texture on the exterior surface?

2: How I can sand this huge thing to prime and spray paint (in gloss black), when there the texture is so irregular. To add to this, would fibreglassing the exterior make this sanding and priming process even harder due to the fibreglass texture?

The top will be plywood. I was planning to do it in these stages: Leave table as two sections, to fibreglass interior. Join and then fill gaps, add top, and fibreglass exterior (maybe?).

I am also unsure as to what fibreglass material and resin to use. It is PLA, but I understand that polyester resin works best for fibreglass chopped strand mat - will this adhere to the PLA as well as Epoxy?

Please leave suggestions, and any alternative methods of production are welcome.