Finally finished building Architect's main body, won't seamweld everything until she's prepped to paint. Also I'm thinking off stripping my Jinrai in a isopropyl bath and repainting her with an airbrush, would there be a more convenient way to safely strip the paint?

I don't know if you need a whole bath. Even a little 91% isopropyl alcohol should start removing most paints on contact. As far as I can tell, it won't damage the plastic either, or at least it takes a hell of a lot more alcohol to damage plastic than to remove paint. Either way though it shouldn't be that big of a deal. Make sure you re-prime though, even if the alcohol doesn't remove much of the primer.
Isopropyl and lots of melamine sponges. If you used acrylics you don't need to bathe her. Just soak a sponge and give her a good massage everywhere.
Simple Green bath overnight works without affecting the plastic if you painted using acrylic.

Also, how can i archive this glossy finish?

Lots and lots of polishing and thin layers of gloss coat.
>Also, how can i archive this glossy finish?
A good gloss coat. I got fairly close with polished plastic and a can of Mr. Super Clear.