Seamlines can still be removed. You just have to be VERY patient as you'll be sanding over the seamlines with progressively fine sandpaper until you hit something like water-sanding with 2000 grit, and it'll look perfectly fine. There are always ways to counter what you think is "impossible". Seriously, keep trying to pull Mwu la Flaga on Gunplas, it works really well.
Please Note: I left seams on account of the impossibly of erasing them. Even the model that was built by an expert on the pictures of this box had to leave seam lines!
