Need help with N3PMesh file format

[Leadron]

Hello everyone, greetings to you all.
I'm currently working on creating a 3d model to later add to the game. For that, first I need to know a few things, such as :

• What is the size of the model
• Pivot position
• Textures and so on...

My first step is to extract the existing file with the aim that I will use it as a guide.
At least I found 2 tools that I could use, there are converter made by srmeier and 3D Object Converter made by Zoltán Kárpáti.
Thanks to them, for that purpose it has actually been fulfilled, but here I found a case that is quite interesting for me.
Many N3PMesh models are not read correctly by those tools as in the pictures below :



Since I know a little about graphics and 3d programming (VB6, It's actually an old language, but I can still use it for this purpose)
So I decided to write my own converter. I have analyzed file N3PMesh, and managed to display it in viewport, but it seems I made the same mistake with them.



I analyzed that file further, and stuck on some segments like in the picture below :



Is there anyone here who has worked with these files who is willing to share their knowledge with me?
What segment is it? or if I read it wrong can anyone tell me the right way?
I would be very grateful if someone would help me with that. Thanks in advance.

Best Regards
Leadron