Would recommend to print a small non ganged feeder first to find out whether the design is working for you and your printer. Download one of the offered STL-files and get it on the printer. Insert plastic and/or paper tapes and see whether the tapes are hold in place and which height of feeder you actually need.
To get some feeders matching your demands perfectly there are two alternatives to go: Load OpenSCAD and open the sFeeder.scad file to create your custom designs or use the Thingiverse Customizer (makerbot account needed) to do so. If your familiar with scripting or CAD going for OpenSCAD is best choice and gives you all possibilities. Some relevant parameters you might want to modify depicts the image.
The feeder base has 3 holes per lane for mounting. The default design is made to be mounted with 6mmx3mm round magnets to a ferrous table or M3 screws.
Get latest version of parametric model and STLs at github