I’m not sure what you have / don’t have, but this recent thread may be of interest ?
A rail/screw conversion is very tempting (it takes all my willpower to resist the urge…) but it’s also a fairly long upgrade, that will turn out to be a project by itself, which will only delay your long project further 
If you’re the kind of user eyeing a rail/screw conversion, then the HDZ is (obviously) definitely something to consider indeed…