Sorry, I changed the plan a bit and then I'll start the step 3 right away.
<Step 3>
With that, you can check each sub-groups visually. So now you need to know some key information about hex editing.
Before we start, this whole process could have been possible thanks to stuffs that the mariokart64n's script provided. Please remember that.
Now click the body object and right click > Object Properties and go to User Defined section.
You can see numbers. Those are key information.
mesh_data = #(#(44, 44, 44, 44, 44, 44), #(176, 400, 168, 2770, 1367, 5981), #(6123536, 6131280, 6148880, 6156272, 6278152, 6338300), #(), #(), #())
6th sub-group have 5981 vertices and those vertex information are contained in TMCL file, starting from the address 6338300(0x60B6FC).
Goto address 6338300 and check first 12 bytes.
it's 3EB2BB87 BF6EE6B4 3DFEC2DA.
And you can also find this number in TMC file of PC version.
But you have to reverse it to find this.
Reveres it like this.
12345678 12345678 12345678 → 78563412 78563412 78563412
Then it's going to be 87BBB23E....
Now you grab this reversed 12 bytes and find it on TMC file of PC version.
And remember the address of that point in PC TMC file. The address will be 0x4DC40.
Now you get both address on each files.
If you copy the first 12 bytes and paste it into PC TMC file after reversing, then you are converting the first vertex of 6th sub-group.
Now let's go to the next vertex.
The address of first vertex was 6338300.
Add 44 there.
It's 6338344. That's the address of second vertex. Go to there and check first 12 bytes again and reverse it.
Search for that reversed number on PC TMC file again. it will also be there.
Now you get both address of second vertex on each files.
So now you can convert second vertex, too.
You have to repeat it 5981 times, because there are 5981 vertices in 6th sub-group.
I know you can't handle them all manually, so you should have to make a tool for that.
I might be able to provide a tool for that, but in most case, you should have to make your own tool for your own purpose.
Because there are no separate tool makers. You can't say, 'I make the mod, you provide a tool.'
If you can get one from other, then you just got lucky. that's all.
And there are no ready-made tool for each and every steps for you.
For me it was the nature of this league. I'm sorry that I have to say it like this.
And if you are done it with 5981 vertices, then you learned how to convert 6th-group.
You can do it for another sub-groups also.