Just a couple things from my experience- hiding the wires will make you feel 100% better about your setup; I know you already said you are going to fix that, but just my .02. The antennas are super important to me. They make such a difference, I couldn't even believe it. As far as the dash install, I've been holding out on my horn/siren/PA for a while now because I just cant figure where I can put it, and it still be practical, but...
Well, some nice equipment, post some pics as you make improvements! nice to see you taking your time to work on it on your own. I'm a big fan of that! Thats how I've learned from my mistakes!