I had wanted to try hollow form items for years but I didn’t have a hollowing attachment. So I had a go at making my own home made unit. It’s basically a copy of the Monster Hollowing system. Seems to work very well. Check it out. http://www.rocky-roost-woodturnings.com/wood-turning-blog/articulating-arm-hollower.html
Dimensions: 12” tall 5.75” at it’s widest point. Made out of BC grown walnut.