Fusion actually has a really good tab option. I usually put just 4 tabs on a part this size. Make them .2" wide and .04 or .05 thick. These tabs are only .02 thick. When the part is done I just tap it with a hammer and it will fall out. I finished the edges with a belt sander. The material is aluminum because that is what i was able to salvage from the scrap bin. Some steel would have been nice but I didn't have enough.