I don't really know what you mean. What's a 1/4 length ram?
What do you mean by a pulley reduction 4:1? From what? Stepper? Servo? what size? What lead of ballscrew? What kind of speeds do you want to achieve? You're not really giving me any info that's useful. If you feel you've got it all covered, and this is more of a show and tell, and I'm asking too many questions, no problems, I'm happy to get out the popcorn and watch. Don't worry, as Captain Jack Sparrow would say, I'm rooting for you, mate!