Alex, do you know if these units have other back plates available than the 10 inch size or 7 1.2 inch ? from the manual it is hard to tell. Have you worked with this model? wondered what you opinion would be on making up a 6 1/4 inch back plateIf you just need units that work, then those will probably do it. You will probably have to buy new gel strings for them, but I am sure that Wybron will still make you them for those units. They will be a little bit of a PITA to set up as you will have to run non-dim power to each of them, but you do save the cost of a PSU. Make sure that you have enough 5-pin cable to hook them all up.
I work with a children's community theater organization and I am thinking about purchasing about 6 scrollers. I don't need them to be very fancy, I am just looking for them to be able to scroll at least 10 frames at a decent speed. I've been looking around on the internet and I found some old, used Wybron scrollers that don't need power supplies:
Wybron Scroller - UsedLighting.com
Even though these are outdated, I think it would serve my purpose. What do you think?