I don't think the Drover was based totally on a Dove. It was built only for Australia in 49 I think with 3x 10 Mk2 145HP DH 4 cylinder Motors no superchargers. Used by air ambulance services. Fixed undercarriage and TAILWheel The TAIL is very Un DH in shape. TAA had one at least. Not a lot built and they has a less than Auspicious Career. Quite a lot of them Crashed I can only think they were built to a COST Limit eventually re-engined with Lycoming 180 HP IO 360 motors with CS props .The Doves and Herons were better Planes by far. Nose wheel and retractable. A few Herons (The 4 engined Variant) had their supercharged gipsy 6's replaced with "Flat" Lycomings saving considerable weight and Probably Maintenance costs. Connair and Tasmanian Airways had Herons as I recall. .
One thing interesting I recall from a Drover crash Inquiry. The Judge (Or Coroner as the case May be) said. To one of the technical witnesses." Sir, you said THIS plane Has 3 engines. WHICH SIDE has 2 of them" .I've always remembered that.
I Know the Heron was flying in TAS. in the early 90s because I encountered One in Wynyard in FOUL weather when I was doing a C/ME /IFR renewal, check in a Beech Duchess. . Nev