In looking for a good front spoiler for my E46 M3, I came into contact with MASHAW. Check out his website. Mike is a reputable dealer who has made a name for himself by producing high quality lightweight parts for the E36 M3 and various Porsche body panel kits. I asked what it would take for him to get interetsed in the hood and trunk for the M5 and 10 parts was his answer. I asked him if he would take a look at a spoiler kit as well and he appeared very interetsed in both pieces of business. I'll have more information this week. My guess is that there is at least ~100lb to be gained between the hood and deck.
If there is interest from the board, I'll see if I can get him to take deposits as a means to kick the work off. That way each of us can deal directly with him without having to try to pull something together over the web. Please reply so I can get a gauge of interest. Please specify hood/deck/fr spoiler/r spoiler to denote interest.
Guy
2000 M5
2001 M3