There's a couple of ways you can deal with the scratches - depending on your budget
(1) polish it with a plastic polish like novous (sp)
(2) Use ultra fine steel wool - sometimes I'll use 0000 (hardware store)
(3) In the cosemetics dept. you can find nail polish boards for high gloss finishes(one board will have 3 seperate polishing grits) - these are also great for polishing canopies before a future dip.
(4) In the automotive supply or jewelry supply you can usually find polishing papers upto 2k grit - or micro papers.
For really effective metal finishes you'll need to have a glass-arse smooth surface and virtually perfect seams (an area where I fail alot).
May I also suggest using a tooth brush under tap water to get the dust out of the seams.
3d modelling is an option
a true mental excercise in frusrtation