How do Keith.

You do well to put the towers on a sliding base for differing widths apart.

ie use some T channel aluminium rack and rebate the T track in 25mm baseboard and then space the towers when ever you feel the need to widen them?or just have them permanently affixed to a base board because there's no stability in that design ie a gust of wind will blow em over :heehee: and thats not good for the motors//mechanics if you want to avoid damage.