This is basically add all the "dangly bits", those bits that would have got knocked off or got in the way during all the other stages. I use mainly CA for this. Final thing is to attach the antenna wire. I use grey tint invisible mending thread for this.
Not the easiest model to build, but boy does it look great when complete? Is it accurate? I never put a model over plans; this looks like the pictures of Helldivers that I've seen so it's accurate enough for me. Would I build another? You bet, with folded wings next time. Could it be improved? Well of course separate control surfaces would be nice, but that would bump up the price. The only real improvements I would like to see are the instructions and the painting guide, using proper colour names instead of Revell paint mixes.