Quote Originally Posted by Wejjmeister View Post
Was trying to keep the rails and screws as close to each other as possible thats all.
That is a sensible priority.
I'm being intentionally vague here since, as you've realised, you've got to weigh up the factors and if I just say how I'd do it, then you might miss out on finding your own better solution. Ideally you need to minimise distance mentioned for rigidity, not allow swarf to build up on the ballscrew (especially if rotating nut) and not cost an unreasonable amount.