Help with creating a server mod

Hi again, over the last month or so i've been busy trying to create a mod with custom assets, i've read through the provided documentation on my last post, and i am for some reason unable to join the modding discord, so i come here (hopefully) for some answers.

i am able to make simple stat tweaks or say clones of existing pieces within the games with caried stats, however trying to create my own unique item with its own mesh has been an uphill battle i've fought for some time, i've read through all the bepinex documentation, and the ones provided on this website, (unfortunately) there just doesn't seem to be a lot on it, most of the documentation shows say how to rig or how to actually make bundles, but the server side bepinex file or mod which can actually inject your customised assets is something which is never spoken about, unless im getting something majorly wrong it surely isn't that difficult, i've even gone to a few different AI's to see if i'm wrong and it lead me to the custom asset importer however every time i try to use it, it's as if SPT just doesn't recognise it.

so i am really stumped here, and would greatly appreciate some help.
thank you.