Has anyone tried to fit a Rotary Axis 🇬🇧

I have completed and have been using the CNC Heavy Neama 23 version forabout 15 months or more. I have recently had some projects that require the use of a rotary Axis atachment. I am thinking of buying a comercialy ready made atachment, but would much prefer to make my own. Are there any members that have contemplated making a rotary Axis to go with The Topsy machines If so are ther any thoughts as to howto intergrate it into the ardunio bord set up?

any help would be apriciated