So i might try to mod SADX To be more like SH, And do things like replace textures and sounds, maybe edit level layouts a little, change non-cutscene voices, maybe edit models a little, and etc etc etc etc. Here's my goal list in the spoiler.
Spoiler:
SONIC ADVENTURE DX - SONIC HEROES EDITION GOALS
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Art
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Replace Character Textures with textures from Sonic Heroes/Make them SH-esque
Change Powerup art to ones from SH
Edit hud to resemble SH hud
Change menu art
Edit some level textures
Edit character upgrades to resemble the SH style
Edit Logo
Edit Character Select screen
New chao textures?
Replace enemy textures to better resemble SH ones
Maybe change skyboxes?
Change Sonic Casino Pinball to be Bingo Highway/Casino Park?
Change springs, spikes, etc.
Change Chao's textures to resemble SA2B/Sonic Channel design
Change certain Special effects?
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Sound
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Change Jump Noises for characters. (Sonic/Sonic, Tails/Tails, Knuckles/Knuckles, Amy/Amy, Big/Big, Gamma/Omega)
Replace certain noises with others (Enemy defeat noises, Crunches, Homing attacks, 1UP Noise, etc)
Change non-cutscene voices (Omega will be used for Gamma)?
Change Menu Noises
Change Tikal's hint noise to the Hint Ring noise?
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Music
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Replace Menu Music
Replace Character Themes?
Change Jingles
Change Boss Music?
Maybe change Stage songs?
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Others
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Change Score screen?
Maybe change Stage Title font if possible?
Maybe edit models a little?
Maybe slightly modify Stage layouts to be more like SH's level design?
Maybe Omochao-ify Tikal's voice and maybe make it seem like Omochao was sent by Tikal...?
Expect screenshots soon and move this to the correct forum if needed. If anyone would like to work, lemme know. I can't pay you with money sadly, but it would be cool if you could work and or suggest stuff, and submissions would be cool.