used to follow local ice forum back in those days hence familiar with nicks u mentioned. not active but been to a few TTs when in taman desa. nice gear u have. hope u see your e39 build on this forum. maybe can get some idea from yours. still planning mine.
re the unknown factors u mentioned though not necessarily providing answer to your questions.
1. on my e34, the stock alternator powered 5 genesis profile amps (3 x profile 2 ultra, 1 x profile 2 and 1 x profile sub) with no problems. i'd imagine e39 should do just fine for your listed equipment. that said, i'm going with class D all the way for my e39 install.
2. for wiring, i'm planning to use stock speakers wiring. since i'm keeping stock bmw nav headunit, just need short runs of rca from where it'll tap into signal from stock harness to amp(s).
3. will almost certainly need to mod door to fit Dyn mids. i'm going with focal K2P and i think 6.5 3 inch depth probably right at the edge of fitting and maintaining stock factory look, i.e. without having to mod door cards.
4. for tweeter mounting, planning to fit in stock sail panel, if can't fit will then mount at stock midrange position on door card. shouldn't be a problem mounting tweeter on a pillars. there are a few e39 builds on diyma with tweeters and even midrange on a pillars.
re the unknown factors u mentioned though not necessarily providing answer to your questions.
1. on my e34, the stock alternator powered 5 genesis profile amps (3 x profile 2 ultra, 1 x profile 2 and 1 x profile sub) with no problems. i'd imagine e39 should do just fine for your listed equipment. that said, i'm going with class D all the way for my e39 install.
2. for wiring, i'm planning to use stock speakers wiring. since i'm keeping stock bmw nav headunit, just need short runs of rca from where it'll tap into signal from stock harness to amp(s).
3. will almost certainly need to mod door to fit Dyn mids. i'm going with focal K2P and i think 6.5 3 inch depth probably right at the edge of fitting and maintaining stock factory look, i.e. without having to mod door cards.
4. for tweeter mounting, planning to fit in stock sail panel, if can't fit will then mount at stock midrange position on door card. shouldn't be a problem mounting tweeter on a pillars. there are a few e39 builds on diyma with tweeters and even midrange on a pillars.