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If you don't like your 12 you will be SEVERELY underwhelmed with a pair of 6.5's. 90% of the T-line discussion on car audio forums are not Tlines, but slot ported boxes. If you can't operate Mathcad, don't have Martin King's worksheets, then expect that your trial and error will be a failure and take MANY iterations to get it to somewhat work. Add to that you are now using drivers that have way less capability so even if you do it perfectly you will have a significantly worse response in every aspect and it is an exercise in stupidity. I understand though that there is a ton of misinformation on the web and it isn't your stupidity, but the sites that you have found positive responses towards T-lines in a car. Don't take it personally, but take everything you have read with a grain of salt and dig through the nonsense. In general instead of trying to be different you should be honest with your goals and build the system YOU want based on your goals and not other peoples imagination. This will save you a lot of time, money and yield way better results.

More drivers, more cost, less output in either domain you are chasing. It'll be different, but that doesn't make it better. Used to be people built 4th order BP to be different, now the gullible public found different and thought better and there are a ton of terrible installs with happy uneducated owners floating around. If you want to you surely can, but realize that the only portion of it that has any value is the novelty which is super dubious at best.

Do not use anything skar. That being said, why would you want to use the 6.5s? Just for looks? The 12s will kill them in cone area and efficiency. I don't see a point unless you prefer them just for aesthetics.

Me too. That is why I have 4 of them ;)

Looks sharp. Not a bad price point either. J