Wing Chun dummy

I am going to be building a Wing Chun dummy soon and was wondering if anyone had tips for making one. I would purchase one, but I don’t want to spend $300+ on one then another $50+ for shipping. I was going to buy one from a martial arts supplier, but no one around me sells them, so I decided just to build one. I am gonna put the 3 arms on it and the leg base, put some padding on the head, but was wondering if anyone here had tips for making one. Or if there is a site that describes it in detail. Thanks.