Typically for styrene I use Tenex7R but I figured I would give the Micro Mark equivalent a try. I have to say I really like this glue. You do have to be careful because it is really potent and can melt away your precious details if you aren't careful.
After construction was complete I hit the cage with a light coat of Primer.One of the best paints to give you a metal-like finish is Alclad II. I've been using this stuff for years and it gives a really professional finish to your work.
You start by base coating the piece with Gloss Black. Alclad has a base coat they make for this but any gloss black paint will do.
After that dries you spray and I repeat spray on light coats of the metal paint. In order to get a really nice finish you have to use an airbrush with this stuff.