Dash help!!!!!!!!!
You don't want bass up there b/c it will rattle to high hell. Try tearing off the dash pad and seeing what you have to work with. I would think you could do something pretty nice by cutting up the dash pad and flush mounting mids and tweets up there if need be.
But...I'd pick up a spare dash pad before doing anything drastic. I believe they are no longer available as service parts.

take a look at CDT's site if you want to see a good way of adding 'speakers' to the dash
http://cdtaudio.com/stagefront_centerstage_systems.htm
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Maybe you would get the sound you are looking for by pillar or dash mounting the tweeters from your door set, but there's no reason or benefit to have four mids up front. You'd just be taking a bunch of risk and cost for no major benefit other than uniqueness.
MB Quarts should resell just fine, especially if you have original paperwork.
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