Well, the Mach 460 has a version of a component system. But, the tweeter you have on the sail panel you can't hallow out and put the new tweeter in there. People have tried. So, the best way to go about it is to use 1/2 birch and fiberglass to mold a new sail panel and either paint it black or wrap it in black vinyl.
You can mount the crossovers in the trunk and run your wires from there. But it depends on how creative you wanna get with everything. You can come up with a creative mount for the amp and crossovers or tuck them under rear deck.
It's all up to you and your wallet.