Heya and welcome to the server. You better tell your fanbase quick, more people are always good for the server. And im sure it can handle them. As for the UI you can see all the aviable UIs with pictures here:
http://www.project1999.org/forums/sh...ad.php?t=11949
i think theres a somewhat classic UI aviable too. If you look at the "Getting started" page you can also get classic Loading-screens, sounds/musik and the classic login client.