I also purchased the ProTech ST7 and am quite happy with it. In addition I purchased a ProAim Baseplate an rails from DVCity.com (https://www.dvcity.com/dvshop/PROAIM-RS-1-Rail-system-for-Follow-Focus-Mattebox-Dof-35mm-adapter-canon-sony-nikon-panasonic-jvc-camera.html) that works great on the ProTech ST7. You can also get an inexpensive Matte Box and Follow Focus there. Do yourself a favor and also purchase the 9″ cage to attach accessories.
Best,
Dave