So, uh I've decided to make my own version of this hack, with a planned release date sometime in the middle of 2017.
It will feature all tracks from MKDD, along with all new tracks based off of the Art style of MKDD, in that nature, it is similar to the concept of N64 Circuit.

Thanks to Ambiance69 for playing a huge part in sound design, the hack will feature complex insturment replacement,
and music hacks, to truly capture the feel of MKDD, and thank to Yoshi Master for providing me with good Midis.

And thanks to Dave, for allowing me to use his restored version of GCN Mario Circuit.

A trailer for the Mushroom Cup, a big thanks to Yami for recording the video.

Mushroom Cup video:
https://www.youtube.com/watch?v=CxASVutnyLw

Star Cup video:
https://www.youtube.com/watch?v=-2rOzg7I9mc&t=22s

Karts






FAQ:

Q: Will the Battle tracks be replaced?
A: Yes.

Q: Will there be any texture hacked characters, or tracks?
A: No.

Q: What will you do with the retro course slots?
A: They'll be replaced with brand new tracks based off the art style of MKDD.

Q: Will there be any new, or ported Karts?
A: Yes, both actually.

Q: How about characters?
A: Koopa Troopa will replace Dry Bones, and King Boo will replace R.O.B.

Q: How about ASM hacks?
A: Well, I can't ASM Hack at the moment, I might learn how to, though.
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That reminds me of this:

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It doesn't seem like he has, and he most likely wont, he's been doing this for quite while now.
We've been telling him these things for almost a year now, I think it's clear what we tell him wont have any effect.
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No fun allowed.
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Here's a another track I just made for this Hack, GCN Wario Colosseum:
https://www.youtube.com/watch?v=dSYj0oHmEl8&t=8s
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The MS Paint style you call "2D" looked horrible, I have to admit, my suggestion is to stick with pre-rendered 3D graphics all the way, 2D sprites like things from the original Super Mario Bros, and SMW just look very ugly, and out of place in NSMBDS, unless the entire art style of your hack, or perhaps a world is based around that art style.
Not saying plainly 2D graphics in NSMB can't look good, but there's a certain way you have to do it to pull of something like that, and have it look good. But, as far as I can tell right now, the way you do "2D" graphics doesn't work.

As soon as you switched to pre-rendered 3D graphics, it looked pretty good, though.
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Patching an SM64DS ROM with a patch for an MKDS hack? Seems logical.
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