I think you are better off continuing to look for more tutorials on YouTube/other sites, as most (if not all) of the plugin makers and coders that were here have stopped being active or just straight up left.
Sorry I couldn’t provide you with a better answer, I hope you figure out your problem.
actually working on this problem right now. trying to get it through spigot but they took down their support for it after a DMCA issue from developer of the program…. will try to make a guide if i can figure it out.
its looking like we would need to make the server a thermos server. seems that is the type that took old code and optimized it so 1.7.10 servers could get a little support.
and if you have the supers customer forms with the powernbt and the addon to add the custom forms you make that should be everything that’s needed still tinkering with those to get them to actually work right
oh this is quite the fun project lol.
finally got a server with plugins made and got the supers custom plugin to load but having a heck of a time getting the add on to actually make your own forms config to work right.
but almost there once i get that figured out ill start making a guide and provide links to all the scattered parts lol.