Ok, so I'm getting ready to pull my car out and start working on it again, starting with some electrical (gauges, msd btm, and uninstall some crap anti-theft from previous owner).

Anyway i want to do it right and relay my own fuse block so I can add more later.Heres what i was thinking:
-take 12v key-on source from convertible top harness (located in center console) to power my relay (30A)
-run fused (30A) #10 line to my a fuse block i buy
-than just run whatever wire and fuse to whatever needs the power
-i was planing on putting this all on a piece of plexiglass and mounting it under the rear seat. My battery will be in the trunk so this seems like a decent half way point to me between source and load.

Now for the questions:
-is 30A adequate?
-would this be on ok spot for the MSD box or is it to far from the ignition system?
-anyone seem any problems?

heres a paint sketch lol: