DRO mount for Emco Unimat 3/4, MJ-189 mini lathe

Simple mount for a DRO (modified caliper) to the base of a EMCO Unimat 3 or 4 or a similar type mini lathe clone, e.g. MJ-189.
Required:
- printed parts
mounts: DRO_1 & DRO_2,
caps: DRO_1b & DRO_2b
carriage driver arm DRO_3
- 4x M3x10mm screws
- 1x left-handed 300mm caliper (for EMCO Unimat 3: https://www.amazon.de/gp/product/B00CDROLCG/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1)

Why a left-handed caliper?
Because then you can mount it on the right side of the carriag