Gareth you need to decide what you’re doing, and why, the right gear for the job will be self evident. Otherwise you’re likely to waste a lot of effort assembling several rigs and selling them before settling on one you like.
As one who built several scopes long ago, it’s admirable to see someone attempting a DIY barn-door tracker - but please understand that this is unlikely to be much more than a learning exercise and ultimately a waste of time and effort - you will appreciate why many skip that and buy a decent mount.
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