I have never liked any 6x9's except a couple of very rare exceptions, so rare you could never find some to buy even.
BUT, if you can build the cone as light as possible(an absolute must for accuracy) and have the same stiffeness on all areas, there is no problem running an oval speaker.
Not easy to design but they did what it takes and I know it will be great, will find out Monday when mine arrive
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Arc Audio mini amp(s) they have 3, I will use the right one(s) for the particular system complexity, budget, etc...I am having the crossovers modified in some of the 4 channels so I can use them bi-amped, mids and tweets. I can fit one 4 channel and one 2 channel easily in the Bose amp location, fitting the 4 channel and the sub amp(same size) there may be tough but should work as well. If I can get enough bass out of the doors then the single 4 channel would be great in a bi-amped setup.
I am testing some Morel 9's with Seas full size aluminum dome tweeters right now, I will look more at the specs on the 10's and some Dyn's but the cost goes up dramatically, not many would pay that much per driver and I am not sure they would be worth the cost.
I have a set of the ID's on the way, they may be the best bet since I can make them fit, pretty large radiating surface, not huge excursion but there is a limit on what can fit in the doors, mounting depth and excursion combined is quite limited. I will be testing, from data already worked out at ID, a ported drop in enclosure that shows being able to play sub bass! It this works out we could run a lower cost two channel amp at 75watts per channel but running the 4 channel bridged at 250 watts would be sweet I am sure

I love power when I can make it work for me(my old Tacoma had a quad amped front stage with 900 watts per side, dual midbasses had 600 of that, you want to hear kick drums???


If I get the ported setup to work then less deadening of the outer door skin will be needed much less.
If not and get good output from open back setup then much more deadening, I may include aluminum channels, pre taped, to bond to the doors before deadening, it cuts down on the amount of mat needed, saves weight, I did this to my car already.
I am looking into providing wiring kits including RCA's etc, where everything possible is plug and play.
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The plan for now is to use stock locations for the mids and tweets and if I do anything with subs, maybe something for the Verts like rebuild the waterfall underneath to fit a sub in.
If the stock tweeter location cannot be made to have a proper stage height, etc..I will probably make up some A pillars with smaller tweets mounted there, I have done many with great success. (there is only one way to do this right with very slight changes to tune it for the specific vehicle, never have heard a factory setup done correctly nor many DIY or audio shop installs either but I have heard some pretty good, just not quite on the money which makes a huge difference.
OK, giving away all my secrets, mostly, no worries as I have nothing to hide, if others can learn and do better from anything I do, great, we need more doing things that work
(P.S. I have not figured out a great deal of this on my own, just learned from the masters, added my own touches as needed and went from there but my first audio install was 41 years ago
Rick