I did some searching on this page, about 10 threads which seemed like good info, but couldn't find it, so here I go: Is it possible to have a skin and the original unit both on the same map, or do skins virtually replace the old one with no way to keep it? Thanks!
convert the model u dled (or if it was in wc3, extract it via mpq browser) to mdl (with the wc3 file converter u can find on this site in tools section) and open the mdl file with notepad or wordpad. then press ctrl+F and type in 'textures' then change the first path to what ever u want (but remember it ofcourse) then save the mdl and convert it back as mdx. u now have 2 mdx's that look both the same but have another path. import both models and use the skin for the new mdx u made