Any Gundam Breaker 3 players? A couple of noob questions.

Just imported my copy of this game and absolutely adore it already, but have a few questions as I'm fumbling through building/modifying my Gundam.

1. Is there a way to retain a Gundam model that you've built, but to upgrade the stats to match the higher level parts you've collected? Or, is the only way to upgrade your attributes by replacing lower level parts with higher level parts even though your Gundam design will inevitably change?

2. Is there a way to save/load full paint templates? I spent a fair amount of time painting and decorating my Gunpla and was surprised to see that parts swapped in didn't automatically adhere to the color scheme in my model. I've saved a color palette before, but don't see a way to load what I've saved, so I'm not sure I'm understanding the painting/design mechanic there.

3. Finally, a gameplay question. Is there any sort of strategy in increasing your chances for parts/rare parts when battling? For example, if you kill an enemy with an EX move, does that have an impact on what drops, or is everything just random?

Thanks for your insight! The English translation is very well done, but certain game mechanics right now are just obtuse to me.